Evaluation of Soybean Varieties Resistant to Soybean Cyst ... ISU... · Roundup® herbicide, and...

A supplement to Iowa Farmer Today.

Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa—2014

Gregory L. Tylka, Gregory D. Gebhart, Christopher C. Marett, and Mark P. Mullaney

Department of Plant Pathology and Microbiology Iowa State University

This report is available online at www.isuscntrials.info.

IPM 52 Revised December 2014

View of the central Iowa location.

Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa in 2014

Gregory L. Tylka, Gregory D. Gebhart,

Christopher C. Marett, and Mark P. Mullaney Department of Plant Pathology and Microbiology

Introduction

Use of resistant soybean varieties is a very effective strategy for managing soybean cyst nematode (SCN), and numerous SCN-resistant soybean varieties are available for Iowa soybean farmers. Each year, public and private SCN-resistant soybean varieties are evaluated in SCN-infested fields throughout Iowa by Iowa State University personnel. The research described in this report was performed to assess the agronomic performance of maturity group (MG) I, II, and III SCN-resistant soybean varieties and to determine the effects of the varieties on SCN numbers or population densities.

Materials and Methods

In the northern Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide, and seven non-glyphosate-resistant (three LibertyLink® and four conventional), SCN-resistant soybean varieties were evaluated using conventional herbicides. The northern Iowa experiments were conducted near Newell (northwest Iowa), Mason City (north central Iowa), and Arlington (northeast Iowa). In the central Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide and six conventional SCN-resistant soybean varieties were evaluated using conventional herbicides. The central Iowa experiments were conducted near Moorhead (west central Iowa), Ames (central Iowa), and Urbana (east central Iowa). In the southern Iowa district, 51 glyphosate-resistant, SCN-resistant soybean varieties were evaluated using Roundup® herbicide and six non-glyphosate-resistant (three LibertyLink® and three conventional), SCN-resistant soybean varieties were evaluated using conventional herbicides. The southern Iowa experiments were conducted near Pacific Junction (southwest Iowa), Leighton (south central Iowa), and Fruitland (southeast Iowa).

Location-specific details.

1 In the SCN HG type test results, “1” indicates >10% reproduction on Peking, “2” indicates >10% reproduction on PI 88788, “5” indicates >10% reproduction on PI 209332, and “7” indicates >10% reproduction on PI 548316.

SCN-susceptible varieties also were planted in the experiments for comparison purposes. Plots were four 17-foot-long rows spaced 30 inches apart and were planted at 10 seeds per foot, with four replications per variety. Seed companies were encourage to treat their seed with fungicide and insecticide. Seeds that were received untreated were treated with CruiserMaxx® by Iowa State University personnel. A complete treatment list is included at the end of the report. Preplant herbicide was applied to each location. The Leighton location was planted using “no-till” methods, and the Moorhead location was minimally tilled. At all other locations, the seed bed was tilled prior to planting. All plots were end trimmed to a length of 14 feet during September. Maturity notes were taken at one location in each district, but for reference purposes, maturity dates are listed in the tables for all three locations in the same district. Maturity was recorded as the number of days after August 31st that a variety was considered mature. A variety was considered mature when 95 percent of the pods had turned brown. For all locations, just prior to harvest, average plant height and lodging (1 = all plants fully erect, 5 = all plants flat) were assessed in each plot. For each location, the center two rows of each four-row plot were harvested with a plot combine, total seed weight per plot and seed moisture were determined, and total plot seed weights subsequently were converted to bushels per acre. Resistant varieties and susceptible check varieties are grouped separately and are listed in the report in order of descending yield.

At the beginning of the growing season, plots were sampled for the presence of SCN. Soil samples, consisting of 10 one-inch-diameter, six- to eight-inch-deep soil cores were collected from the center 14 feet of the center two rows of each plot immediately after planting. SCN cysts were extracted from each soil sample, and SCN eggs were extracted from the cysts and counted. SCN egg population densities also were determined for each plot at the end of the growing season in an identical manner. Because of the consistent relationship between higher soil pH and SCN population densities, all varieties also were field tested for tolerance to iron deficiency chlorosis (IDC). Each variety was planted in a hill plot consisting of five seeds per hill, with four replications per variety, at two high pH field locations. Notes were taken for IDC symptoms at each location approximately four weeks after planting and again at five weeks after planting. Varieties were rated on a scale of “1” to “5” with a “1” indicating no symptoms of IDC present and a “5” indicating plant death due to IDC. The scores from each location were averaged together and an overall rating was assigned to each variety. One variety highly resistant to IDC and one variety susceptible to IDC also were included in the experiments as checks. The highly resistant variety scored an average of 1.4 and the susceptible variety scored an average of 2.8. The scores from these IDC field tests are listed in each location table in the report for reference.

Location Initial SCN Population

(eggs / 100 cc soil) HG Type1 Planting Date Harvest Date

Newell (NW) 5,460 2.5.7 May 17th October 8th Mason City (NC) 1,610 1.2.5.7 May 20th October 9th Arlington (NE) 7,140 2.5.7 May 19th September 30th Moorhead (WC) 14,880 2.5.7 May 21st October 15th Ames (C) 3,777 2.5.7 May 28th October 21st Urbana (EC) 3,101 2.7 May 27th October 10th Pacific Junction (SW) 5,345 2.5.7 May 16th October 16th Leighton (SC) 742 1.2.5.7 May 9th October 7th Fruitland (SE) 1,320 7 May 14th October 6th

Data Presentation In the report, soybean yield and SCN reproduction are displayed graphically in addition to in the tables. In the graphs, yield is represented by the length of the gray bars. SCN reproduction is represented by the length of the blue section of the bars. SCN reproduction was calculated by determining the reproductive factor (RF) for each variety. RF is calculated by dividing the average final SCN population density by the average initial SCN population density for each variety. What this means is that if a variety has an RF value of 5.0, the SCN population density for those plots was 5 times greater at harvest than it was at planting. Conversely, an RF value of 0.5 means the SCN population density for those plots at harvest was one half the population density at planting. It is important to remember that this number is location specific and may vary substantially under different environmental conditions, soil types, and nematode populations.

Summary

The results of the experiments illustrate the benefits of growing SCN-resistant soybean varieties for management of this important soybean pest. At locations with the most significant SCN reproduction, many of the soybean varieties with SCN resistance had greater yields than susceptible varieties, although some resistant varieties had greater yields than others. At most locations, end-of-season SCN population densities were significantly greater in plots where susceptible varieties were grown relative to plots planted with resistant varieties. Nematode control is an extremely important aspect of growing SCN-resistant soybean varieties that must be considered when selecting soybean varieties. Growing soybean varieties in SCN-infested fields in an attempt to maximize soybean yields in the short term without any consideration of the effect of the varieties on SCN population densities will seriously reduce the long-term soybean productivity of the land.

The results of these experiments illustrate that SCN-resistant varieties can suppress SCN reproduction and provide increased soybean yields relative to using susceptible varieties. Currently, there are three main genetic sources for SCN resistance genes in commercial soybean varieties, namely PI 88788, Peking, and PI 437654 (also known as Hartwig and PUSCN14 resistance, the latter also known as CystX® resistance). Each of these sources of SCN resistance contains several genes that confer resistance to the nematode. Consequently, soybean varieties developed from the various sources of resistance may not all contain the same genes in the same combinations. All of these sources of SCN resistance allow limited reproduction of only a few soybean cyst nematodes. Resistant varieties must be used in an integrated management program, along with the use of nonhost crops and scouting for early detection of SCN, to maximize yields and minimize reproduction of the pest on a long-term basis.

The data presented in this report are from a limited number of locations and should be used only as a beginning point for developing a SCN management program for any specific field. Performance of individual SCN-resistant soybean varieties in SCN-infested fields will vary among locations and years. Growers are encouraged to evaluate several SCN-resistant soybean varieties at their own locations to determine the best varieties for their local conditions.

Acknowledgments

This research was supported by soybean checkoff funds through a grant from the Iowa Soybean Association. Appreciation is expressed to the staff of the Iowa State University Research and Demonstration Farms, especially Vince Lawson and Kent Berns. Gratitude also is expressed to Kermit Grote of Newell, Randy and Jess Lutz of Mason City, Alex Recker of Arlington, John Melby of Moorhead, Ed McKinley of Urbana, Chris Dashner of Pacific Junction, Mark Groenendyk of Leighton, and Ron Shepard of Fruitland for use of land for some of the experiments. Funded, in part, by the soybean checkoff through a grant from the Iowa Soybean Association and also by the Iowa Agriculture and Home Economics Experiment Station.

Table 1. Newell (NW Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

NuTech/G2 Genetics 7240 2.4 Peking 2.3 28 32.3 1.3 62.2 1 2,700 0.3Asgrow AG2035 2.0 PI 88788 1.6 25 30.8 1.5 61.2 2 12,975 2.4LG Seeds C2020R2 2.0 PI 88788 2.6 25 28.8 1.4 60.8 3 9,150 2.6Pioneer P19T01R 1.9 PI 88788 2.2 26 31.0 1.2 60.6 4 5,100 1.4Kruger K2-2402 2.4 PI 88788 1.4 28 31.0 1.6 60.1 5 6,975 1.3NK S18-C2 1.8 PI 88788 2.0 25 31.5 1.6 60.1 5 8,125 2.5Stine 19RF32 1.9 PI 88788 3.2 26 26.0 1.3 59.7 7 10,075 1.4Prairie Brand PB-1947R2 1.9 PI 88788 3.1 25 27.0 1.3 59.4 8 13,875 4.6Kruger K2-2103 2.1 PI 88788 2.0 26 29.0 1.5 59.2 9 13,825 2.4Prairie Brand PB-1956R2 1.9 PI 88788 2.4 26 26.8 1.3 59.2 9 17,150 2.7NK S20-T6 2.0 PI 88788 2.0 24 28.0 1.4 58.9 11 28,525 6.1LATHAM L1968R2 1.9 PI 88788 2.3 25 31.8 1.3 58.9 11 6,950 1.7Asgrow AG1935 1.9 PI 88788 1.9 24 28.0 1.4 58.5 13 12,100 3.8LATHAM L2128R2 2.1 PI 88788 2.2 28 27.3 1.4 58.1 14 6,975 1.5JACOBSEN 740NR2 2.0 PI 88788 2.5 25 27.7 1.3 57.9 15 12,400 3.8Legend Seeds LS 20R20N 2.0 PI 88788 2.1 22 28.3 1.4 57.8 16 8,025 2.2Legend Seeds LS 20R524N 2.0 PI 88788 2.4 26 29.5 1.5 56.7 18 10,300 2.3HiSOY HS 23A42 2.3 PI 88788 2.5 25 28.3 1.3 55.8 19 10,450 1.7Stine 17RF62 1.7 PI 88788 1.6 23 29.5 1.5 55.0 20 8,625 1.2Asgrow AG2433 2.4 PI 88788 1.7 29 29.8 1.3 55.0 20 18,550 3.6NK S17-B3 1.7 PI 88788 3.2 21 23.8 1.3 54.8 22 22,100 5.2Viking 2144R2N 2.1 PI 88788 2.4 27 27.5 1.4 54.4 23 6,825 1.4Federal Hybrids F205NRR2Y 2.0 PI 88788 1.9 25 26.0 1.4 54.2 24 11,275 2.7Pioneer P22T69RR 2.2 Peking 2.5 26 25.3 1.1 54.0 25 2,025 0.4Curry 1187 1.8 PI 88788 1.8 21 24.3 1.1 54.0 25 8,075 1.3NuTech/G2 Genetics 7216 2.1 PI 88788 2.3 25 31.5 1.4 53.8 28 9,700 2.1NK S22-S1 2.2 PI 88788 1.6 28 25.3 1.4 53.8 28 8,375 2.0NuTech/G2 Genetics 7204R2 2.0 PI 88788 2.8 27 25.3 1.3 53.6 30 8,800 3.4Dairyland Seed DSR-1990/R2Y 1.9 PI 88788 1.8 25 29.0 1.5 53.2 31 10,075 3.1Kruger K2-2201 2.2 PI 88788 1.6 27 28.5 1.5 52.8 32 5,975 1.6NorthStar Genetics NS 1800NR2 1.8 PI 88788 1.5 22 27.5 1.1 52.7 33 12,400 2.8Merschman Apache 1525RR2 2.5 PI 88788 2.2 29 28.0 1.4 52.6 34 8,600 1.7LG Seeds C1899R2 1.8 PI 88788 2.1 23 25.0 1.3 52.4 35 13,900 2.0Great Lakes Hybrids GL2039R2 2.0 PI 88788 2.1 25 26.5 1.5 52.3 36 12,000 1.9Cornelius CB22R60 2.2 PI 88788 1.9 27 26.0 1.1 51.4 37 8,025 1.5LATHAM L2448R2 2.4 PI 88788 2.4 29 29.5 1.3 50.7 38 9,675 2.3HiSOY HS 22A21 2.2 PI 88788 1.8 27 27.3 1.4 50.7 38 5,050 0.9Federal Hybrids F235NRR2Y 2.3 PI 88788 2.3 27 25.8 1.3 50.3 40 8,025 1.1Stine 20RD20 2.0 PI 88788 1.9 27 25.3 1.1 49.0 42 8,350 1.6Pioneer 92Y11 2.1 Peking 2.6 26 23.3 1.0 48.9 43 2,325 0.6HiSOY HS 19A42 1.9 PI 88788 2.1 25 25.3 1.4 47.9 44 17,650 3.7Hoegemeyer HPT 2233NRR 2.2 PI 88788 2.8 25 27.8 1.1 47.5 45 12,075 4.8Asgrow AG2134 2.1 PI 88788 1.7 27 25.8 1.3 47.2 46 9,725 1.94 STAR 2Y212 2.2 PI 88788 2.0 27 27.5 1.4 47.1 47 9,850 2.3Wensman W 3214NR2 2.1 PI 88788 1.9 28 25.0 1.3 46.0 48 11,400 2.0JACOBSEN 732NR2 2.2 PI 88788 1.8 28 23.8 1.3 45.0 49 11,100 2.8Pioneer P21T97R 2.1 PI 88788 2.0 26 25.0 1.3 44.8 50 10,775 1.8Dairyland Seed DSR-2250/R2Y 2.2 PI 88788 1.8 28 25.0 1.4 44.8 50 7,325 1.6Prairie Brand PB-2188R2 2.1 PI 88788 2.2 27 24.3 1.4 44.7 52 10,400 2.6Champion 21R34N 2.1 PI 88788 1.8 27 25.0 1.3 44.6 53 13,675 2.3Legacy Seeds LS2034NRR2 2.0 PI 88788 1.8 26 25.5 1.1 42.6 54 14,850 2.8

Mean 2.1 - 2.1 26 27.3 1.3 53.4 - 10,473 2.3LSD3 (P = 0.10) - - - - NS NS NS - 8,749 -

NK S22-F8 2.2 None 1.8 27 27.8 1.5 57.7 17 7,900 4.2Pioneer 92Y12 2.1 None 1.8 23 26.3 1.1 54.0 25 10,075 2.3Pioneer 91Y90 1.9 None 1.9 25 27.3 1.1 49.9 41 16,800 3.0

Mean 2.1 - 1.8 25 27.1 1.2 53.9 - 11,592 3.2Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 4,878 eggs per 100 cc soil; HG Type 2.5.7 (58% on PI 88788, 4% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

Figure 1. Newell (NW Iowa) Glyphosate-resistant.

- Average initial SCN population density 4,878 eggs per 100 cc soil.- HG Type 2.5.7 (58% on PI 88788, 4% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Yield (bu/acre) SCN Reproduction (RF)

0 10 20 30 40 50 60 70

NuTech/G2 Genetics 7240Asgrow AG2035

LG Seeds C2020R2Pioneer P19T01R

Kruger K2-2402NK S18-C2

Stine 19RF32Prairie Brand PB-1947R2

Kruger K2-2103Prairie Brand PB-1956R2

NK S20-T6LATHAM L1968R2

Asgrow AG1935LATHAM L2128R2

JACOBSEN 740NR2Legend Seeds LS 20R20N

Legend Seeds LS 20R524NHiSOY HS 23A42

Stine 17RF62Asgrow AG2433

NK S17-B3Viking 2144R2N

Federal Hybrids F205NRR2YPioneer P22T69RR

Curry 1187NuTech/G2 Genetics 7216

NK S22-S1NuTech/G2 Genetics 7204R2

Dairyland Seed DSR-1990/R2YKruger K2-2201

NorthStar Genetics NS 1800NR2Merschman Apache 1525RR2

LG Seeds C1899R2Great Lakes Hybrids GL2039R2

Cornelius CB22R60LATHAM L2448R2

HiSOY HS 22A21Federal Hybrids F235NRR2Y

Stine 20RD20Pioneer 92Y11

HiSOY HS 19A42Hoegemeyer HPT 2233NRR

Asgrow AG21344 STAR 2Y212

Wensman W 3214NR2JACOBSEN 732NR2

Pioneer P21T97RDairyland Seed DSR-2250/R2Y

Prairie Brand PB-2188R2Champion 21R34N

Legacy Seeds LS2034NRR2

NK S22-F8Pioneer 92Y12Pioneer 91Y90

Susceptible Check Varieties

Table 2. Newell (NW Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Merschman Chippewa 1523 LL 2.3 PI 88788 2.9 28 34.5 1.6 60.9 1 12,025 1.6Viking L212N 2.1 PI 88788 3.7 28 29.0 1.8 58.0 2 8,975 0.9Viking 2078N 2.0 PI 88788 2.6 25 30.3 1.5 55.3 3 10,950 1.0Champion 2313NLL 2.3 PI 88788 3.0 28 28.0 1.6 54.4 4 18,325 2.1eMerge e2162 2.1 PI 88788 2.4 25 29.0 1.6 53.9 5 10,825 1.2eMerge e1993 1.9 PI 88788 2.3 26 28.5 1.4 51.5 8 9,525 2.1eMerge e2282 2.2 PI 88788 1.7 28 28.8 1.4 48.4 10 9,775 1.0

Mean 2.1 - 2.7 27 29.7 1.6 54.6 - 11,486 1.4LSD3 (P = 0.10) - - - - 3.0 0.2 NS - NS -

Pioneer 92Y12 2.1 None 1.8 25 29.0 1.4 52.9 6 9,700 0.8Pioneer 91Y90 1.9 None 1.9 25 26.8 1.4 51.6 7 13,825 1.8NK S22-F8 2.2 None 1.8 28 27.5 1.5 50.5 9 12,525 1.4

Mean 2.1 - 1.8 26 27.8 1.4 51.7 - 12,017 1.4

Figure 2. Newell (NW Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 8,855 eggs per 100 cc soil; HG Type 2.5.7 (58% on PI 88788, 4% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50 60 70

Merschman Chippewa 1523 LLViking L212NViking 2078N

Champion 2313NLLeMerge e2162eMerge e1993eMerge e2282

P ioneer 92Y12Pioneer 91Y90

NK S22-F8

Suscept ible Check Variet ies


- Average init ial SCN population density 8,855 eggs per 100 cc soil.- HG T ype 2.5.7 (58% on P I 88788, 4% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Table 3. Mason City (NC Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Stine 19RF32 1.9 PI 88788 3.2 26 29.0 1.5 56.0 1 3,950 2.5NuTech/G2 Genetics 7240 2.4 Peking 2.3 28 30.3 1.5 54.2 2 1,675 1.2JACOBSEN 740NR2 2.0 PI 88788 2.5 25 30.0 1.5 53.9 3 5,750 6.4Pioneer P22T69RR 2.2 Peking 2.5 26 27.8 1.1 53.6 4 2,625 1.5Stine 20RD20 2.0 PI 88788 1.9 27 28.3 1.5 53.3 5 2,775 1.7Asgrow AG1935 1.9 PI 88788 1.9 24 29.3 1.5 53.3 5 3,250 2.2LATHAM L1968R2 1.9 PI 88788 2.3 25 30.3 1.5 53.0 7 3,225 2.7Asgrow AG2035 2.0 PI 88788 1.6 25 31.3 1.4 52.7 8 7,400 4.7LATHAM L2128R2 2.1 PI 88788 2.2 28 28.0 1.4 52.5 9 3,700 2.3HiSOY HS 19A42 1.9 PI 88788 2.1 25 29.0 1.5 52.2 10 3,725 3.2LATHAM L2448R2 2.4 PI 88788 2.4 29 30.5 1.5 52.0 11 4,275 6.6Federal Hybrids F205NRR2Y 2.0 PI 88788 1.9 25 30.3 1.5 52.0 11 9,125 5.8NorthStar Genetics NS 1800NR2 1.8 PI 88788 1.5 22 30.0 1.1 51.6 13 4,050 4.4Hoegemeyer HPT 2233NRR 2.2 PI 88788 2.8 25 32.5 1.4 51.5 14 4,300 3.3Asgrow AG2134 2.1 PI 88788 1.7 27 31.3 1.4 51.5 14 7,725 4.2Great Lakes Hybrids GL2039R2 2.0 PI 88788 2.1 25 28.3 1.5 51.4 16 5,775 1.9Prairie Brand PB-1947R2 1.9 PI 88788 3.1 25 28.0 1.4 51.1 17 2,125 1.3Legend Seeds LS 20R524N 2.0 PI 88788 2.4 26 29.0 1.4 50.9 18 3,650 2.0Cornelius CB22R60 2.2 PI 88788 1.9 27 30.0 1.4 50.7 19 6,900 3.8NK S17-B3 1.7 PI 88788 3.2 21 27.5 1.4 50.7 19 12,575 8.1Stine 17RF62 1.7 PI 88788 1.6 23 28.5 1.4 50.7 19 5,000 3.3LG Seeds C2020R2 2.0 PI 88788 2.6 25 29.8 1.5 50.4 22 5,300 4.0Prairie Brand PB-1956R2 1.9 PI 88788 2.4 26 29.5 1.4 49.9 23 6,425 4.4NK S22-S1 2.2 PI 88788 1.6 28 27.0 1.5 49.8 24 2,975 1.7Viking 2144R2N 2.1 PI 88788 2.4 27 28.3 1.1 49.8 24 4,000 4.6HiSOY HS 23A42 2.3 PI 88788 2.5 25 28.5 1.4 49.5 27 4,900 2.7NK S20-T6 2.0 PI 88788 2.0 24 28.0 1.5 49.1 28 19,725 13.6Pioneer 92Y11 2.1 Peking 2.6 26 28.5 1.4 49.0 29 5,475 3.4Asgrow AG2433 2.4 PI 88788 1.7 29 30.0 1.4 49.0 29 7,325 4.1Legacy Seeds LS2034NRR2 2.0 PI 88788 1.8 26 30.3 1.6 48.7 31 3,325 2.9JACOBSEN 732NR2 2.2 PI 88788 1.8 28 27.8 1.4 48.7 31 4,275 3.8Kruger K2-2103 2.1 PI 88788 2.0 26 30.8 1.4 48.6 33 6,800 2.8Prairie Brand PB-2188R2 2.1 PI 88788 2.2 27 29.0 1.4 48.6 33 4,275 2.9Kruger K2-2201 2.2 PI 88788 1.6 27 27.3 1.3 48.3 35 4,550 3.1Champion 21R34N 2.1 PI 88788 1.8 27 28.8 1.3 48.2 37 5,675 2.9HiSOY HS 22A21 2.2 PI 88788 1.8 27 28.0 1.4 48.2 38 3,900 3.2Merschman Apache 1525RR2 2.5 PI 88788 2.2 29 29.3 1.5 47.8 39 4,700 3.4Pioneer P19T01R 1.9 PI 88788 2.2 26 28.3 1.0 47.7 40 2,825 1.9Pioneer P21T97R 2.1 PI 88788 2.0 26 29.3 1.1 47.7 40 3,050 1.8Dairyland Seed DSR-1990/R2Y 1.9 PI 88788 1.8 25 30.8 1.8 47.5 42 5,100 3.2NuTech/G2 Genetics 7216 2.1 PI 88788 2.3 25 30.8 1.3 47.3 43 3,875 3.1Wensman W 3214NR2 2.1 PI 88788 1.9 28 28.0 1.3 47.3 43 5,100 3.1Kruger K2-2402 2.4 PI 88788 1.4 28 28.5 1.5 47.2 45 2,600 1.7Federal Hybrids F235NRR2Y 2.3 PI 88788 2.3 27 25.8 1.3 47.1 46 8,450 4.1NuTech/G2 Genetics 7204R2 2.0 PI 88788 2.8 27 27.8 1.1 46.5 47 7,200 4.4Dairyland Seed DSR-2250/R2Y 2.2 PI 88788 1.8 28 26.8 1.3 46.5 47 5,325 3.4Legend Seeds LS 20R20N 2.0 PI 88788 2.1 22 27.8 1.4 46.4 49 4,450 1.84 STAR 2Y212 2.2 PI 88788 2.0 27 27.8 1.0 46.0 51 10,025 4.7NK S18-C2 1.8 PI 88788 2.0 25 28.5 1.4 46.0 51 5,000 5.6Curry 1187 1.8 PI 88788 1.8 21 27.3 1.3 45.5 53 3,425 2.2LG Seeds C1899R2 1.8 PI 88788 2.1 23 26.8 1.0 42.2 54 12,175 3.9

Mean 2.1 - 2.1 26 28.9 1.4 49.7 - 5,401 3.6LSD3 (P = 0.10) - - - - 2.4 0.2 4.9 - 4,139 -


Mean 2.1 - 1.8 25 28.3 1.2 48.0 - 13,417 10.1Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 1,567 eggs per 100 cc soil; HG Type 1.2.5.7 (51% on PI 88788, 26% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

Figure 3. Mason City (NC Iowa) Glyphosate-resistant.


0 10 20 30 40 50 60

Stine 19RF32NuTech/G2 Genetics 7240

JACOBSEN 740NR2Pioneer P22T69RR

Stine 20RD20Asgrow AG1935

LATHAM L1968R2Asgrow AG2035

LATHAM L2128R2HiSOY HS 19A42

LATHAM L2448R2Federal Hybrids F205NRR2Y

NorthStar Genetics NS 1800NR2Hoegemeyer HPT 2233NRR

Asgrow AG2134Great Lakes Hybrids GL2039R2

Prairie Brand PB-1947R2Legend Seeds LS 20R524N

Cornelius CB22R60NK S17-B3

Stine 17RF62LG Seeds C2020R2

Prairie Brand PB-1956R2NK S22-S1

Viking 2144R2NHiSOY HS 23A42

NK S20-T6Pioneer 92Y11

Asgrow AG2433Legacy Seeds LS2034NRR2

JACOBSEN 732NR2Kruger K2-2103

Prairie Brand PB-2188R2Kruger K2-2201

Champion 21R34NHiSOY HS 22A21

Merschman Apache 1525RR2Pioneer P19T01RPioneer P21T97R

Dairyland Seed DSR-1990/R2YNuTech/G2 Genetics 7216

Wensman W 3214NR2Kruger K2-2402

Federal Hybrids F235NRR2YNuTech/G2 Genetics 7204R2

Dairyland Seed DSR-2250/R2YLegend Seeds LS 20R20N

4 STAR 2Y212NK S18-C2Curry 1187

LG Seeds C1899R2

NK S22-F8Pioneer 92Y12Pioneer 91Y90


- Average initial SCN population density 1,567 eggs per 100 cc soil.- HG Type 1.2.5.7 (51% on PI 88788, 26% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Table 4. Mason City (NC Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

eMerge e1993 1.9 PI 88788 2.3 26 28.5 1.1 51.9 1 5,550 3.0Champion 2313NLL 2.3 PI 88788 3.0 28 28.8 1.9 50.5 3 12,800 10.4Viking L212N 2.1 PI 88788 3.7 28 28.5 1.8 49.2 4 14,300 19.7Merschman Chippewa 1523 LL 2.3 PI 88788 2.9 28 29.0 1.5 49.2 5 13,150 6.0Viking 2078N 2.0 PI 88788 2.6 25 30.3 1.6 46.9 8 12,725 9.6eMerge e2282 2.2 PI 88788 1.7 28 27.8 1.5 46.1 9 7,775 4.1eMerge e2162 2.1 PI 88788 2.4 25 29.3 1.8 43.4 10 7,725 3.4

Mean 2.1 - 2.7 27 28.9 1.6 48.1 - 10,575 8.0LSD3 (P = 0.10) - - - - NS 0.3 3.8 - NS -

Pioneer 92Y12 2.1 None 1.8 25 29.5 1.4 51.1 2 12,700 5.2NK S22-F8 2.2 None 1.8 28 25.5 1.5 48.2 6 16,025 5.4Pioneer 91Y90 1.9 None 1.9 25 29.0 1.0 47.0 7 11,775 7.7

Mean 2.1 - 1.8 26 28.0 1.3 48.7 - 13,500 6.1

Figure 4. Mason City (NC Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 1,845 eggs per 100 cc soil; HG Type 1.2.5.7 (51% on PI 88788, 26% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50 60

eMerge e1993Champion 2313NLL

Viking L212NMerschman Chippewa 1523 LL

Viking 2078NeMerge e2282eMerge e2162

P ioneer 92Y12

NK S22-F8Pioneer 91Y90



- Average init ial SCN population density 1,845 eggs per 100 cc soil.- HG T ype 1.2.5.7 (51% on P I 88788, 26% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Table 5. Arlington (NE Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Asgrow AG2035 2.0 PI 88788 1.7 25 29.0 1.8 65.7 1 6,750 1.3Pioneer P22T69RR 2.2 Peking 2.5 26 24.8 1.5 65.6 2 2,450 0.5NuTech/G2 Genetics 7240 2.4 Peking 2.3 28 28.5 1.8 65.4 3 1,025 0.2HiSOY HS 23A42 2.3 PI 88788 2.5 25 28.0 1.5 63.4 4 5,800 0.8Dairyland Seed DSR-1990/R2Y 1.9 PI 88788 1.8 25 28.8 2.0 63.2 5 3,775 0.7NK S18-C2 1.8 PI 88788 2.0 25 27.8 1.8 63.0 6 3,300 0.4Legend Seeds LS 20R524N 2.0 PI 88788 2.4 26 27.8 2.0 62.6 7 4,000 0.5Prairie Brand PB-1956R2 1.9 PI 88788 2.4 26 27.0 1.9 61.4 8 6,925 0.8Great Lakes Hybrids GL2039R2 2.0 PI 88788 2.1 25 27.3 1.8 61.1 9 4,200 0.6Stine 19RA02 1.9 PI 88788 1.9 27 28.8 1.8 60.6 10 5,000 0.4LG Seeds C2020R2 2.0 PI 88788 2.6 25 27.5 1.8 60.6 10 4,525 0.6LATHAM L1968R2 1.9 PI 88788 2.3 25 28.3 1.9 60.3 12 5,150 0.8HiSOY HS 19A42 1.9 PI 88788 2.1 25 26.5 1.8 60.2 13 4,250 0.5Legend Seeds LS 20R20N 2.0 PI 88788 2.1 22 26.0 1.6 60.2 14 5,900 0.6Prairie Brand PB-1947R2 1.9 PI 88788 3.1 25 25.5 1.6 60.1 15 3,700 0.6NK S22-S1 2.2 PI 88788 1.6 28 26.3 1.6 60.0 16 4,900 0.9Legacy Seeds LS2034NRR2 2.0 PI 88788 1.8 26 27.0 1.8 59.9 17 4,125 0.5Federal Hybrids F205NRR2Y 2.0 PI 88788 1.9 25 27.3 1.6 59.3 18 3,700 0.5Pioneer P21T97R 2.1 PI 88788 2.0 26 27.5 1.4 58.9 19 5,600 1.0JACOBSEN 740NR2 2.0 PI 88788 2.5 25 26.5 1.5 58.5 20 4,975 0.6Asgrow AG1935 1.9 PI 88788 1.9 24 27.0 1.6 58.0 21 6,750 0.9LATHAM L2128R2 2.1 PI 88788 2.2 28 26.3 1.5 57.5 22 4,350 0.6Kruger K2-2103 2.1 PI 88788 2.0 26 27.5 1.5 56.8 23 4,300 0.5Kruger K2-2402 2.4 PI 88788 1.4 28 26.8 1.9 55.9 24 5,400 0.7NK S17-B3 1.7 PI 88788 3.2 21 24.5 1.6 55.9 24 4,375 0.5Curry 1187 1.8 PI 88788 1.8 21 24.0 1.4 55.4 26 4,675 0.6Stine 19RF32 1.9 PI 88788 3.2 26 25.8 1.5 55.3 27 5,475 0.6NK S20-T6 2.0 PI 88788 2.0 24 23.8 1.4 55.2 28 7,975 1.1Pioneer 92Y11 2.1 Peking 2.6 26 25.8 1.4 54.8 29 2,850 0.3HiSOY HS 22A21 2.2 PI 88788 1.8 27 25.8 1.4 53.0 30 5,025 0.7Cornelius CB22R60 2.2 PI 88788 1.9 27 26.8 1.5 52.9 32 4,525 0.9Dairyland Seed DSR-2250/R2Y 2.2 PI 88788 1.8 28 27.3 1.5 52.6 33 4,400 0.4NuTech/G2 Genetics 7204R2 2.0 PI 88788 2.8 27 25.8 1.1 52.4 34 3,775 0.5Prairie Brand PB-2188R2 2.1 PI 88788 2.2 27 27.3 1.6 52.1 35 5,225 0.8Champion 21R34N 2.1 PI 88788 1.8 27 25.3 1.5 51.8 36 4,125 0.6NuTech/G2 Genetics 7216 2.1 PI 88788 2.3 25 27.8 1.4 51.5 37 2,725 0.3Asgrow AG2134 2.1 PI 88788 1.7 27 26.8 1.3 51.2 38 6,375 0.8Wensman W 3214NR2 2.1 PI 88788 1.9 28 26.3 1.4 50.0 39 3,600 0.5Kruger K2-2201 2.2 PI 88788 1.6 27 25.5 1.5 49.9 40 6,575 1.0LG Seeds C1899R2 1.8 PI 88788 2.1 23 26.3 1.4 49.7 42 4,625 0.5Pioneer P19T01R 1.9 PI 88788 2.2 26 24.3 1.1 49.1 43 5,400 0.7Federal Hybrids F235NRR2Y 2.3 PI 88788 2.3 27 26.3 1.8 49.1 43 4,475 0.6Hoegemeyer HPT 2233NRR 2.2 PI 88788 2.8 25 28.5 1.4 48.9 45 2,725 0.4Viking 2144R2N 2.1 PI 88788 2.4 27 25.3 1.3 48.1 47 3,925 0.7JACOBSEN 732NR2 2.2 PI 88788 1.8 28 24.0 1.5 48.0 48 6,800 0.7Asgrow AG2433 2.4 PI 88788 1.7 29 26.8 1.4 47.4 49 8,050 0.74 STAR 2Y212 2.2 PI 88788 2.0 27 25.3 1.4 47.3 50 4,550 0.6LATHAM L2448R2 2.4 PI 88788 2.4 29 27.8 1.6 47.2 51 5,250 0.8Merschman Apache 1525RR2 2.5 PI 88788 2.2 29 27.0 1.4 43.7 52 5,500 0.8Stine 17RF62 1.7 PI 88788 1.6 23 26.5 1.6 42.2 53 5,150 1.0NorthStar Genetics NS 1800NR2 1.8 PI 88788 1.5 22 26.3 1.3 40.1 54 2,425 0.2

Mean 2.1 - 2.1 26 26.6 1.5 55.1 - 4,734 0.6LSD3 (P = 0.10) - - - - 1.8 0.3 4.8 - 2,448 -



Figure 5. Arlington (NE Iowa) Glyphosate-resistant.


0 10 20 30 40 50 60 70

Asgrow AG2035Pioneer P22T69RR

NuTech/G2 Genetics 7240HiSOY HS 23A42

Dairyland Seed DSR-1990/R2YNK S18-C2

Legend Seeds LS 20R524NPrairie Brand PB-1956R2

Great Lakes Hybrids GL2039R2Stine 19RA02

LG Seeds C2020R2LATHAM L1968R2

HiSOY HS 19A42Legend Seeds LS 20R20NPrairie Brand PB-1947R2

NK S22-S1Legacy Seeds LS2034NRR2

Federal Hybrids F205NRR2YPioneer P21T97R

JACOBSEN 740NR2Asgrow AG1935

LATHAM L2128R2Kruger K2-2103Kruger K2-2402

NK S17-B3Curry 1187

Stine 19RF32NK S20-T6

Pioneer 92Y11HiSOY HS 22A21

Cornelius CB22R60Dairyland Seed DSR-2250/R2Y

NuTech/G2 Genetics 7204R2Prairie Brand PB-2188R2

Champion 21R34NNuTech/G2 Genetics 7216

Asgrow AG2134Wensman W 3214NR2

Kruger K2-2201LG Seeds C1899R2

Pioneer P19T01RFederal Hybrids F235NRR2YHoegemeyer HPT 2233NRR

Viking 2144R2NJACOBSEN 732NR2

Asgrow AG24334 STAR 2Y212

LATHAM L2448R2Merschman Apache 1525RR2

Stine 17RF62NorthStar Genetics NS 1800NR2

NK S22-F8

Pioneer 91Y90Pioneer 92Y12



Table 6. Arlington (NE Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Champion 2313NLL 2.3 PI 88788 3.0 28 29.3 1.6 57.2 1 6,000 1.9eMerge e2162 2.1 PI 88788 2.4 25 27.0 1.6 53.8 3 4,900 1.2Viking L212N 2.1 PI 88788 3.7 28 30.0 1.8 53.5 5 6,350 1.9Viking 2078N 2.0 PI 88788 2.6 25 27.0 1.5 53.0 6 6,375 2.3eMerge e2282 2.2 PI 88788 1.7 28 26.3 1.4 52.1 7 3,500 1.2Merschman Chippewa 1523 LL 2.3 PI 88788 2.9 28 30.5 1.5 51.2 8 9,275 3.9eMerge e1993 1.9 PI 88788 2.3 26 27.5 1.1 48.9 10 4,775 1.4

Mean 2.1 - 2.7 27 28.2 1.5 52.8 - 5,882 2.0LSD3 (P = 0.10) - - - - 2.3 0.3 NS - NS -


Mean 2.1 - 1.8 26 26.1 1.3 52.6 - 4,708 1.0

Figure 6. Arlington (NE Iowa) Conventional.


0 10 20 30 40 50 60

Champion 2313NLLeMerge e2162Viking L212NViking 2078NeMerge e2282

Merschman Chippewa 1523 LLeMerge e1993

NK S22-F8

Pioneer 91Y90Pioneer 92Y12




Table 7. Moorhead (WC Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

JACOBSEN 847NR2 2.7 PI 88788 2.2 35 36.8 1.4 72.3 1 5,000 0.3NuTech/G2 Genetics 7250 2.5 Peking 2.5 29 34.8 1.6 71.2 2 3,275 0.2Asgrow AG2835 2.8 PI 88788 2.5 31 40.8 2.1 69.9 3 4,675 0.3Pioneer 92Y53R 2.5 Peking 2.1 29 36.3 1.4 69.6 4 4,550 0.2NK S29-G4 2.9 PI 88788 1.8 35 41.8 1.5 69.5 5 4,400 0.2Asgrow AG2935 2.9 PI 88788 2.9 38 40.3 2.1 69.3 6 4,950 0.2NK S27-J7 2.7 PI 88788 1.8 37 41.3 1.6 69.2 7 5,600 0.3Champion 26R83N 2.6 PI 88788 2.3 30 35.0 1.5 68.8 8 3,700 0.2Curry 1252 2.5 Peking 2.6 28 35.5 1.5 68.8 8 4,300 0.3LG Seeds C2916R2 2.9 PI 88788 2.4 29 34.5 1.5 68.2 10 4,150 0.2NK S28-A2 2.8 PI 88788 2.5 34 37.0 1.8 68.0 11 3,000 0.2NK S26-P3 2.6 PI 88788 2.5 31 38.0 1.6 67.8 12 3,075 0.2Legacy Seeds LS2834NRR2 2.8 PI 88788 2.2 36 39.5 2.0 67.6 13 3,800 0.2NuTech/G2 Genetics 7273 2.7 PI 88788 2.4 34 36.0 1.3 67.5 14 5,325 0.3Dairyland Seed DSR-2612/R2Y 2.6 PI 88788 2.8 32 37.8 1.5 67.1 15 4,700 0.3Stine 26RD02 2.6 PI 88788 2.5 30 37.0 1.6 66.9 16 3,825 0.2Stine 30RE02 3.0 PI 88788 2.3 36 38.8 1.5 66.7 17 4,150 0.3JACOBSEN 745NR2 2.5 PI 88788 2.5 30 33.3 1.0 66.7 17 4,225 0.34 STAR 2Y313 3.1 PI 88788 2.9 36 39.3 1.6 66.6 19 3,350 0.2Asgrow AG2735 2.7 PI 88788 2.1 34 42.3 1.8 66.3 20 4,150 0.2Pioneer P24T19R 2.4 PI 88788 2.2 29 32.3 1.4 66.0 21 4,825 0.3Pioneer P28T33R 2.8 PI 88788 3.0 38 35.3 1.4 65.9 22 3,675 0.2LATHAM L2758R2 2.7 PI 88788 2.0 31 36.3 1.5 65.9 22 2,625 0.1Prairie Brand PB-2319R2 2.3 PI 88788 2.6 25 32.0 1.4 65.6 24 2,650 0.2HiSOY HS 28A42 2.8 PI 88788 2.2 34 37.8 1.4 65.6 24 7,450 0.4Federal Hybrids F235NRR2Y 2.3 PI 88788 2.6 25 33.8 1.5 65.6 24 3,825 0.3Merschman Coolidge 1532RR2 3.2 PI 88788 2.7 37 41.3 2.0 65.5 27 3,725 0.3Hoegemeyer HPT 2860NRR 2.8 PI 88788 1.9 33 36.3 1.3 65.5 27 4,575 0.2Dairyland Seed DSR-2909/R2Y 2.9 PI 88788 2.3 34 36.3 1.4 64.8 29 3,975 0.2LG Seeds C2534R2 2.5 PI 88788 2.0 32 37.5 1.9 64.7 30 4,725 0.3Stine 28RE20 2.8 PI 88788 2.4 31 32.5 1.6 64.0 32 4,900 0.3Prairie Brand PB-2556R2 2.5 PI 88788 3.1 28 38.8 1.9 63.8 33 4,250 0.3Kruger K2-2905 2.9 Peking 2.7 38 43.0 2.3 63.7 34 3,225 0.2Dairyland Seed DSR-2810P/R2Y 2.8 Peking 2.1 30 42.5 1.6 63.6 35 5,125 0.2NorthStar Genetics NS 2199NR2 2.2 PI 88788 1.8 26 35.8 1.5 63.4 36 5,300 0.3HiSOY HS 26A32 2.6 PI 88788 3.2 30 35.0 1.6 63.4 36 5,550 0.3Federal Hybrids F255NRR2Y 2.5 PI 88788 2.8 30 38.0 1.6 63.4 36 4,025 0.3Asgrow AG2933 2.9 PI 88788 3.0 37 37.5 1.9 63.3 39 5,300 0.3Kruger K2-3004 3.0 PI 88788 2.4 37 39.5 1.9 62.5 40 4,875 0.3Curry 1279 2.7 PI 88788 2.2 29 34.3 1.0 62.2 41 4,775 0.4Cornelius CB25R78 2.5 PI 88788 2.1 31 36.0 1.6 62.1 42 4,150 0.3LATHAM L2948R2 2.9 PI 88788 2.7 35 38.3 2.1 62.1 42 4,925 0.2Legend Seeds LS 24R563N 2.4 PI 88788 2.4 31 35.8 1.8 61.9 45 5,325 0.2Hoegemeyer HPT 2511NRR 2.5 Peking 2.9 27 35.5 1.6 61.8 46 3,225 0.2Prairie Brand PB-2997R2 2.9 PI 88788 2.8 35 37.8 1.4 61.7 47 4,900 0.3NuTech/G2 Genetics 7261 2.6 PI 88788 2.0 32 38.8 1.1 61.0 48 3,475 0.2HiSOY HS 25A42 2.5 PI 88788 2.0 27 34.0 1.5 60.5 50 12,900 1.0Cornelius CB27R83 2.7 PI 88788 3.0 37 38.5 1.8 60.3 51 5,325 0.4Legend Seeds LS 27R21N 2.7 PI 88788 2.5 36 38.3 2.1 58.7 52 3,775 0.2Pioneer P29T98R 2.9 PI 88788 1.5 31 36.5 1.4 58.6 53 4,725 0.2Merschman Arthur 1531RR2 3.1 PI 88788 2.9 36 41.5 2.0 58.5 54 6,650 0.5

Mean 2.7 - 2.4 32 37.3 1.6 65.2 - 4,568 0.3LSD3 (P = 0.10) - - - - 2.2 0.3 6.5 - 2,361 -

Pioneer 92Y91 2.9 None 2.3 34 37.3 1.5 64.7 30 11,667 0.7NK S28-K1 2.8 None 1.8 33 37.3 1.5 62.0 44 10,375 0.7NK S24-K2 2.4 None 1.7 29 33.5 1.6 61.0 48 13,225 0.8


Figure 7. Moorhead (WC Iowa) Glyphosate-resistant.


0 10 20 30 40 50 60 70 80

JACOBSEN 847NR2NuTech/G2 Genetics 7250

Asgrow AG2835Pioneer 92Y53R

NK S29-G4Asgrow AG2935

NK S27-J7Champion 26R83N

Curry 1252LG Seeds C2916R2

NK S28-A2NK S26-P3

Legacy Seeds LS2834NRR2NuTech/G2 Genetics 7273

Dairyland Seed DSR-2612/R2YStine 26RD02Stine 30RE02

JACOBSEN 745NR24 STAR 2Y313

Asgrow AG2735Pioneer P24T19RPioneer P28T33R

LATHAM L2758R2Prairie Brand PB-2319R2


Merschman Coolidge 1532RR2Hoegemeyer HPT 2860NRR

Dairyland Seed DSR-2909/R2YLG Seeds C2534R2

Stine 28RE20Prairie Brand PB-2556R2

Kruger K2-2905Dairyland Seed DSR-2810P/R2YNorthStar Genetics NS 2199NR2


Asgrow AG2933Kruger K2-3004

Curry 1279Cornelius CB25R78LATHAM L2948R2

Legend Seeds LS 24R563NHoegemeyer HPT 2511NRR

Prairie Brand PB-2997R2NuTech/G2 Genetics 7261

HiSOY HS 25A42Cornelius CB27R83

Legend Seeds LS 27R21NPioneer P29T98R

Merschman Arthur 1531RR2

Pioneer 92Y91NK S28-K1NK S24-K2



Table 8. Moorhead (WC Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

HiSOY HS 28A42 2.8 PI 88788 3.0 41 42.5 2.1 68.7 1 1,925 0.9Iowa State University AR11-113050 2.6 PI 88788/PI 438489B 2.5 30 35.8 1.5 65.9 2 2,000 0.7eMerge e2993 2.9 PI 88788 2.4 37 36.8 1.6 62.9 4 3,025 2.1Iowa State University IAR2601 SCN 2.6 PI 438489B 2.3 34 35.8 1.8 62.1 5 2,125 2.1eMerge e2692 2.6 PI 88788 2.4 34 41.0 1.5 59.7 8 2,400 1.0eMerge e3192 3.1 PI 88788 3.3 40 45.0 1.9 57.8 9 5,675 1.6

Mean 2.8 - 2.7 36 39.4 1.8 62.6 - 2,954 1.4LSD3 (P = 0.10) - - - - 2.2 0.2 3.1 - NS -

NK S28-K1 2.8 None 1.8 38 40.5 1.6 64.5 3 8,550 1.5Pioneer 92Y91 2.9 None 2.3 36 38.0 1.5 62.1 5 11,400 2.5NK S24-K2 2.4 None 1.7 31 37.5 1.8 61.6 7 11,075 2.8

Mean 2.7 - 1.9 35 38.7 1.6 62.7 - 10,342 2.3

Figure 8. Moorhead (WC Iowa) Conventional.


0 10 20 30 40 50 60 70

HiSOY HS 28A42Iowa State Universit y AR11-113050

eMerge e2993Iowa St ate University IAR2601 SCN

eMerge e2692eMerge e3192

NK S28-K1

P ioneer 92Y91NK S24-K2

Suscept ible Check Varieties


- Average init ial SCN population density 2,860 eggs per 100 cc soil.- HG T ype 2.5.7 (13% on P I 88788, 0% on Peking).- RF 1.0 = no change in SCN population densit y over growing season.

Table 9. Ames (C Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Stine 30RE02 3.0 PI 88788 2.3 36 38.5 1.8 63.8 1 3,350 1.2NK S26-P3 2.6 PI 88788 2.5 31 37.0 2.0 63.6 2 2,750 1.4HiSOY HS 28A42 2.8 PI 88788 2.2 34 37.0 1.5 62.5 3 2,450 1.2Dairyland Seed DSR-2909/R2Y 2.9 PI 88788 2.3 34 38.3 2.0 60.8 4 2,175 1.3NuTech/G2 Genetics 7250 2.5 Peking 2.5 29 34.5 1.6 60.6 5 350 0.5Asgrow AG2933 2.9 PI 88788 3.0 37 36.3 1.8 60.6 5 1,825 0.7JACOBSEN 847NR2 2.7 PI 88788 2.2 35 37.3 1.4 60.4 7 2,150 1.0LG Seeds C2534R2 2.5 PI 88788 2.0 32 36.5 2.1 59.8 8 1,525 0.6JACOBSEN 745NR2 2.5 PI 88788 2.5 30 33.3 1.6 59.7 9 1,800 0.8Pioneer P28T33R 2.8 PI 88788 3.0 38 35.3 1.5 59.6 10 2,100 0.8LATHAM L2758R2 2.7 PI 88788 2.0 31 37.8 2.0 59.4 11 2,750 1.1HiSOY HS 26A32 2.6 PI 88788 3.2 30 37.3 2.0 59.3 12 1,475 1.3Curry 1252 2.5 Peking 2.6 28 33.0 2.0 59.1 13 725 0.2Dairyland Seed DSR-2612/R2Y 2.6 PI 88788 2.8 32 36.5 1.6 58.9 14 1,850 0.7Champion 26R83N 2.6 PI 88788 2.3 30 35.3 2.3 58.8 15 1,650 0.6Asgrow AG2935 2.9 PI 88788 2.9 38 36.8 1.9 58.8 15 2,125 0.9NorthStar Genetics NS 2199NR2 2.2 PI 88788 1.8 26 34.0 2.0 58.7 17 2,825 0.9Prairie Brand PB-2319R2 2.3 PI 88788 2.6 25 34.0 2.3 58.6 18 2,100 0.7Federal Hybrids F235NRR2Y 2.3 PI 88788 2.6 25 33.8 2.3 58.2 19 1,900 0.6Curry 1279 2.7 PI 88788 2.2 29 34.0 1.4 58.2 19 1,600 0.4Pioneer 92Y53R 2.5 Peking 2.1 29 36.0 1.5 58.1 21 500 0.2NK S28-A2 2.8 PI 88788 2.5 34 37.0 2.6 58.1 21 1,675 0.5Federal Hybrids F255NRR2Y 2.5 PI 88788 2.8 30 38.5 2.3 58.0 23 1,575 0.7Stine 28RE20 2.8 PI 88788 2.4 31 34.5 1.8 57.9 24 3,175 1.3Hoegemeyer HPT 2511NRR 2.5 Peking 2.9 27 33.8 1.9 57.7 25 725 0.3LATHAM L2948R2 2.9 PI 88788 2.7 35 38.8 2.0 57.5 26 2,925 2.1Stine 26RD02 2.6 PI 88788 2.5 30 35.0 1.9 57.4 27 1,900 0.7Prairie Brand PB-2997R2 2.9 PI 88788 2.8 35 35.3 1.6 57.2 28 1,975 0.7NK S27-J7 2.7 PI 88788 1.8 37 39.5 2.6 56.6 31 1,925 0.6NK S29-G4 2.9 PI 88788 1.8 35 39.8 1.8 56.5 32 1,300 0.6Cornelius CB25R78 2.5 PI 88788 2.1 31 35.3 2.0 56.0 33 1,975 0.4Merschman Coolidge 1532RR2 3.2 PI 88788 2.7 37 38.3 2.1 56.0 33 2,650 0.9Pioneer P24T19R 2.4 PI 88788 2.2 29 35.8 2.1 55.9 35 1,050 0.4Asgrow AG2735 2.7 PI 88788 2.1 34 37.5 1.6 55.9 36 2,025 0.5NuTech/G2 Genetics 7273 2.7 PI 88788 2.4 34 32.3 1.5 55.7 37 1,175 0.4LG Seeds C2916R2 2.9 PI 88788 2.4 29 36.5 1.9 55.7 37 1,525 1.6Legend Seeds LS 24R563N 2.4 PI 88788 2.4 31 37.8 2.1 55.4 39 1,875 0.6Dairyland Seed DSR-2810P/R2Y 2.8 Peking 2.1 30 40.5 1.6 55.3 40 700 0.3Hoegemeyer HPT 2860NRR 2.8 PI 88788 1.9 33 32.8 1.6 54.7 41 2,275 0.84 STAR 2Y313 3.1 PI 88788 2.9 36 40.0 1.6 54.3 42 1,925 1.0NuTech/G2 Genetics 7261 2.6 PI 88788 2.0 32 37.3 1.5 54.0 43 2,300 0.6Merschman Arthur 1531RR2 3.1 PI 88788 2.9 36 40.0 1.8 53.9 44 1,075 0.3Legend Seeds LS 27R21N 2.7 PI 88788 2.5 36 40.0 2.4 53.1 45 1,900 0.5Kruger K2-3004 3.0 PI 88788 2.4 37 38.8 1.9 52.7 46 925 0.3Asgrow AG2835 2.8 PI 88788 2.5 31 35.8 2.4 52.7 46 2,000 0.6Kruger K2-2905 2.9 Peking 2.7 38 41.0 2.3 51.0 48 1,975 0.7Cornelius CB27R83 2.7 PI 88788 3.0 37 40.0 2.0 50.7 49 3,500 1.1Prairie Brand PB-2556R2 2.5 PI 88788 3.1 28 35.8 2.5 50.6 50 2,050 0.5Legacy Seeds LS2834NRR2 2.8 PI 88788 2.2 36 39.8 2.4 50.3 51 2,300 0.5HiSOY HS 25A42 2.5 PI 88788 2.0 27 32.5 1.4 49.1 53 5,825 1.9Pioneer P29T98R 2.9 PI 88788 1.5 31 37.3 2.0 47.3 54 2,125 0.7

Mean 2.7 - 2.4 32 36.6 1.9 56.7 - 1,967 0.8LSD3 (P = 0.10) - - - - 2.2 0.4 6.0 - 1,367 -

Pioneer 92Y91 2.9 None 2.3 34 35.8 1.9 57.1 29 1,900 0.6NK S24-K2 2.4 None 1.7 29 35.0 2.3 57.0 30 6,000 1.6NK S28-K1 2.8 None 1.8 33 36.8 2.5 49.2 52 4,575 1.1


Figure 9. Ames (C Iowa) Glyphosate-resistant.


0 10 20 30 40 50 60 70

Stine 30RE02NK S26-P3

HiSOY HS 28A42Dairyland Seed DSR-2909/R2Y

NuTech/G2 Genetics 7250Asgrow AG2933

JACOBSEN 847NR2LG Seeds C2534R2

JACOBSEN 745NR2Pioneer P28T33R

LATHAM L2758R2HiSOY HS 26A32

Curry 1252Dairyland Seed DSR-2612/R2Y

Champion 26R83NAsgrow AG2935

NorthStar Genetics NS 2199NR2Prairie Brand PB-2319R2

Federal Hybrids F235NRR2YCurry 1279

Pioneer 92Y53RNK S28-A2

Federal Hybrids F255NRR2YStine 28RE20

Hoegemeyer HPT 2511NRRLATHAM L2948R2

Stine 26RD02Prairie Brand PB-2997R2

NK S27-J7NK S29-G4

Cornelius CB25R78Merschman Coolidge 1532RR2

Pioneer P24T19RAsgrow AG2735

NuTech/G2 Genetics 7273LG Seeds C2916R2

Legend Seeds LS 24R563NDairyland Seed DSR-2810P/R2Y

Hoegemeyer HPT 2860NRR4 STAR 2Y313

NuTech/G2 Genetics 7261Merschman Arthur 1531RR2

Legend Seeds LS 27R21NKruger K2-3004Asgrow AG2835Kruger K2-2905

Cornelius CB27R83Prairie Brand PB-2556R2

Legacy Seeds LS2834NRR2HiSOY HS 25A42Pioneer P29T98R

Pioneer 92Y91

NK S24-K2NK S28-K1



Table 10. Ames (C Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

HiSOY HS 28A42 2.8 PI 88788 3.0 41 37.8 1.4 58.8 1 4,900 0.5eMerge e2993 2.9 PI 88788 2.4 37 33.3 1.5 58.4 2 3,925 0.6Iowa State University AR11-113050 2.6 PI 88788/PI 438489B 2.5 30 31.8 1.6 57.3 3 3,425 0.5eMerge e2692 2.6 PI 88788 2.4 34 35.5 1.5 54.9 5 4,375 0.6eMerge e3192 3.1 PI 88788 3.3 40 39.3 1.5 52.5 6 5,725 0.5Iowa State University IAR2601 SCN 2.6 PI 438489B 2.3 34 33.5 1.8 51.8 7 3,600 0.4

Mean 2.8 - 2.7 36 35.1 1.6 55.6 - 4,410 0.5LSD3 (P = 0.10) - - - - 2.1 NS NS - NS -

NK S28-K1 2.8 None 1.8 38 34.8 1.8 55.7 4 13,575 1.7NK S24-K2 2.4 None 1.7 31 33.5 1.5 51.6 8 12,425 1.2Pioneer 92Y91 2.9 None 2.3 36 32.5 1.6 49.4 9 16,850 2.7

Mean 2.7 - 1.9 35 33.6 1.6 52.2 - 14,283 1.9

Figure 10. Ames (C Iowa) Conventional.


0 10 20 30 40 50 60

HiSOY HS 28A42eMerge e2993

Iowa State Universit y AR11-113050eMerge e2692eMerge e3192

Iowa St ate University IAR2601 SCN

NK S28-K1NK S24-K2

P ioneer 92Y91



- Average init ial SCN population density 8,658 eggs per 100 cc soil.- HG T ype 2.5.7 (44% on P I 88788, 1% on Peking).- RF 1.0 = no change in SCN population densit y over growing season.

Table 11. Urbana (EC Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Asgrow AG2933 2.9 PI 88788 3.0 37 33.8 1.8 63.6 1 350 0.3HiSOY HS 28A42 2.8 PI 88788 2.2 34 31.3 1.3 63.4 2 550 0.3Stine 28RE20 2.8 PI 88788 2.4 31 28.3 1.1 61.8 3 725 0.2LATHAM L2758R2 2.7 PI 88788 2.0 31 32.3 1.3 61.8 3 1,675 0.5Prairie Brand PB-2997R2 2.9 PI 88788 2.8 35 31.0 1.3 61.4 5 1,175 0.2Stine 30RE02 3.0 PI 88788 2.3 36 30.3 1.4 61.3 6 700 0.6Dairyland Seed DSR-2909/R2Y 2.9 PI 88788 2.3 34 31.8 1.0 61.3 6 1,625 0.4Asgrow AG2835 2.8 PI 88788 2.5 31 34.8 1.6 60.9 8 1,300 0.3Asgrow AG2935 2.9 PI 88788 2.9 38 30.3 1.4 60.6 9 700 0.2NK S27-J7 2.7 PI 88788 1.8 37 31.3 1.6 60.5 10 700 0.1Legend Seeds LS 27R21N 2.7 PI 88788 2.5 36 34.3 1.6 60.4 11 325 0.2Merschman Arthur 1531RR2 3.1 PI 88788 2.9 36 33.0 1.6 59.8 12 375 0.1NK S29-G4 2.9 PI 88788 1.8 35 33.8 1.5 59.5 13 750 0.8Hoegemeyer HPT 2860NRR 2.8 PI 88788 1.9 33 29.8 1.5 59.4 14 525 0.4LATHAM L2948R2 2.9 PI 88788 2.7 35 32.8 1.5 59.1 15 675 0.2Kruger K2-3004 3.0 PI 88788 2.4 37 35.3 1.8 58.7 16 700 0.2Curry 1279 2.7 PI 88788 2.2 29 29.8 1.0 58.7 16 1,300 0.4HiSOY HS 26A32 2.6 PI 88788 3.2 30 30.3 1.1 57.9 18 400 0.2LG Seeds C2916R2 2.9 PI 88788 2.4 29 28.3 1.0 57.8 19 525 0.2NK S26-P3 2.6 PI 88788 2.5 31 30.8 1.5 57.2 20 500 0.14 STAR 2Y313 3.1 PI 88788 2.9 36 32.0 1.5 57.1 21 450 0.2Pioneer P28T33R 2.8 PI 88788 3.0 38 29.5 1.5 57.0 22 950 0.1Stine 26RD02 2.6 PI 88788 2.5 30 30.0 1.4 57.0 22 750 0.1Dairyland Seed DSR-2810P/R2Y 2.8 Peking 2.1 30 35.5 1.5 56.7 24 225 0.1Kruger K2-2905 2.9 Peking 2.7 38 32.5 1.5 56.6 25 400 0.4NK S28-A2 2.8 PI 88788 2.5 34 30.8 1.5 56.5 26 1,000 0.2Pioneer 92Y53R 2.5 Peking 2.1 29 29.5 1.3 56.0 27 450 0.1Cornelius CB27R83 2.7 PI 88788 3.0 37 33.0 1.5 55.9 28 1,100 0.6JACOBSEN 745NR2 2.5 PI 88788 2.5 30 30.3 1.3 55.6 29 400 0.3JACOBSEN 847NR2 2.7 PI 88788 2.2 35 29.3 1.0 55.5 30 1,375 0.5Prairie Brand PB-2319R2 2.3 PI 88788 2.6 25 28.8 1.1 55.4 31 450 0.6Legacy Seeds LS2834NRR2 2.8 PI 88788 2.2 36 32.0 1.8 55.0 32 975 0.2Hoegemeyer HPT 2511NRR 2.5 Peking 2.9 27 30.3 1.5 54.9 33 550 0.2Pioneer P24T19R 2.4 PI 88788 2.2 29 29.5 1.6 54.2 34 975 0.2Dairyland Seed DSR-2612/R2Y 2.6 PI 88788 2.8 32 31.8 1.1 54.0 35 900 0.5HiSOY HS 25A42 2.5 PI 88788 2.0 27 31.5 1.1 53.8 36 13,450 4.4Legend Seeds LS 24R563N 2.4 PI 88788 2.4 31 29.5 1.4 53.6 37 475 0.3Asgrow AG2735 2.7 PI 88788 2.1 34 31.0 1.3 53.5 38 1,125 0.2NuTech/G2 Genetics 7261 2.6 PI 88788 2.0 32 31.3 1.1 53.4 39 625 0.3LG Seeds C2534R2 2.5 PI 88788 2.0 32 28.3 1.1 52.7 40 1,625 0.7Cornelius CB25R78 2.5 PI 88788 2.1 31 29.0 1.3 52.4 41 1,025 0.2NuTech/G2 Genetics 7273 2.7 PI 88788 2.4 34 28.3 1.3 52.4 41 850 0.2Federal Hybrids F235NRR2Y 2.3 PI 88788 2.6 25 29.5 1.3 52.1 44 500 0.2Curry 1252 2.5 Peking 2.6 28 27.8 1.4 51.8 45 1,050 0.2Federal Hybrids F255NRR2Y 2.5 PI 88788 2.8 30 32.8 1.5 51.4 46 1,050 0.2NuTech/G2 Genetics 7250 2.5 Peking 2.5 29 28.5 1.3 50.9 48 600 0.4Merschman Coolidge 1532RR2 3.2 PI 88788 2.7 37 30.3 1.3 50.6 49 650 0.2Champion 26R83N 2.6 PI 88788 2.3 30 29.5 1.4 50.0 50 2,125 0.3Prairie Brand PB-2556R2 2.5 PI 88788 3.1 28 31.0 1.5 49.9 51 875 0.5NorthStar Genetics NS 2199NR2 2.2 PI 88788 1.8 26 26.8 1.3 49.8 52 1,075 0.4Pioneer P29T98R 2.9 PI 88788 1.5 31 32.0 1.6 47.2 54 1,400 0.2

Mean 2.7 - 2.4 32 30.9 1.4 56.2 - 1,079 0.4LSD3 (P = 0.10) - - - - 3.0 0.3 6.5 - 1,302 -


Mean 2.7 - 1.9 32 30.1 1.3 50.5 - 7,141 2.0Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 3,553 eggs per 100 cc soil; HG Type 2.7 (10% on PI 88788, 0% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

Figure 11. Urbana (EC Iowa) Glyphosate-resistant.

0 10 20 30 40 50 60 70

Asgrow AG2933HiSOY HS 28A42

Stine 28RE20LATHAM L2758R2

Prairie Brand PB-2997R2Stine 30RE02

Dairyland Seed DSR-2909/R2YAsgrow AG2835Asgrow AG2935

NK S27-J7Legend Seeds LS 27R21N

Merschman Arthur 1531RR2NK S29-G4

Hoegemeyer HPT 2860NRRLATHAM L2948R2

Kruger K2-3004Curry 1279

HiSOY HS 26A32LG Seeds C2916R2

NK S26-P34 STAR 2Y313

Pioneer P28T33RStine 26RD02

Dairyland Seed DSR-2810P/R2YKruger K2-2905

NK S28-A2Pioneer 92Y53R

Cornelius CB27R83JACOBSEN 745NR2JACOBSEN 847NR2

Prairie Brand PB-2319R2Legacy Seeds LS2834NRR2Hoegemeyer HPT 2511NRR

Pioneer P24T19RDairyland Seed DSR-2612/R2Y

HiSOY HS 25A42Legend Seeds LS 24R563N

Asgrow AG2735NuTech/G2 Genetics 7261

LG Seeds C2534R2Cornelius CB25R78

NuTech/G2 Genetics 7273Federal Hybrids F235NRR2Y

Curry 1252Federal Hybrids F255NRR2Y

NuTech/G2 Genetics 7250Merschman Coolidge 1532RR2

Champion 26R83NPrairie Brand PB-2556R2

NorthStar Genetics NS 2199NR2Pioneer P29T98R

NK S28-K1

Pioneer 92Y91NK S24-K2



- Average initial SCN population density 3,553 eggs per 100 cc soil.- HG Type 2.7 (10% on PI 88788, 0% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Table 12. Urbana (EC Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Iowa State University AR11-113050 2.6 PI 88788/PI 438489B 2.5 30 32.3 1.5 64.3 1 1,100 1.8eMerge e2692 2.6 PI 88788 2.4 34 38.5 1.5 63.0 4 950 1.4eMerge e2993 2.9 PI 88788 2.4 37 35.0 1.6 61.5 5 1,200 1.2Iowa State University IAR2601 SCN 2.6 PI 438489B 2.3 34 31.5 1.5 60.4 7 850 1.2HiSOY HS 28A42 2.8 PI 88788 3.0 41 40.0 1.9 58.0 8 725 1.0eMerge e3192 3.1 PI 88788 3.3 40 42.0 1.5 57.0 9 1,250 3.3

Mean 2.8 - 2.7 36 36.3 1.6 61.7 - 989 1.6LSD3 (P = 0.10) - - - - 1.4 0.2 3.2 - NS -


Mean 2.7 - 1.9 35 35.6 1.6 62.6 - 9,258 19.4

Figure 12. Urbana (EC Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 660 eggs per 100 cc soil; HG Type 2.7 (10% on PI 88788, 0% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50 60 70

Iowa State Universit y AR11-113050eMerge e2692eMerge e2993

Iowa St ate University IAR2601 SCNHiSOY HS 28A42

eMerge e3192

NK S28-K1P ioneer 92Y91

NK S24-K2



- Average init ial SCN population density 660 eggs per 100 cc soil.- HG T ype 2.7 (10% on P I 88788, 0% on Peking).- RF 1.0 = no change in SCN population densit y over growing season.

Table 13. Pacific Junction (SW Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Curry 1289 2.8 PI 88788 2.3 17 36.5 1.6 71.0 1 1,725 0.3Prairie Brand PB-3352R2 3.3 PI 88788 2.9 21 39.8 1.8 70.2 2 1,925 0.3MorSoy 34x34 3.4 PI 88788 2.7 20 42.8 2.0 70.0 3 2,650 0.6Stine 37RC82 3.7 PI 88788 2.3 25 42.5 1.9 69.8 4 2,825 0.5Dairyland Seed DSR-3313/R2Y 3.3 PI 88788 2.7 20 42.8 1.9 69.0 5 2,550 0.3Federal Hybrids F285NRR2Y 2.8 PI 88788 2.3 15 35.5 1.6 68.4 6 3,575 0.6Stine 32RF32 3.2 PI 88788 2.9 20 38.8 1.8 67.5 7 2,575 0.6Asgrow AG3334 3.3 PI 88788 2.1 21 41.3 1.3 67.5 7 3,525 0.7LATHAM L3248R2 3.2 PI 88788 2.7 17 41.8 1.6 67.3 9 3,750 0.7Hoegemeyer HPT 2993NRR 2.9 PI 88788 2.0 16 39.5 1.5 67.1 10 1,175 0.4LATHAM L3184R2 3.1 PI 88788 3.3 18 39.3 1.8 66.6 11 4,075 0.9Asgrow AG3735 3.7 PI 88788 2.8 24 36.5 1.5 66.5 12 2,625 0.5LG Seeds C3070R2 3.0 PI 88788 2.5 16 38.3 1.9 65.9 13 3,625 0.8Kruger K2-3702 3.7 PI 88788 2.9 27 42.8 2.0 65.8 14 4,800 0.8HiSOY HS 31A32 3.1 PI 88788 3.3 19 39.5 1.9 65.7 15 2,800 0.4Merschman Roosevelt 1535RR2 3.5 PI 88788 2.7 21 41.3 1.9 65.6 16 2,475 0.5Pioneer P35T58R 3.5 PI 88788 3.0 21 45.0 2.4 65.4 17 2,350 0.4Kruger K2-3204 3.2 PI 88788 2.1 23 41.8 1.3 65.4 17 1,875 0.3NuTech/G2 Genetics 7357R2 3.5 PI 88788 2.8 25 45.8 2.1 65.0 19 2,325 0.6LG Seeds C3555R2 3.5 PI 88788 2.6 20 42.5 1.6 64.7 20 2,450 0.5NuTech/G2 Genetics 7384 3.8 PI 88788 3.0 26 50.8 1.8 64.1 21 2,525 0.5NK S39-U2 3.9 PI 88788 3.0 26 40.3 2.1 63.5 22 2,850 0.6Prairie Brand PB-3292R2 3.2 PI 88788 2.6 19 41.0 2.0 63.4 23 2,300 0.6Green Valley Seed GV374 3.7 PI 88788 2.6 26 45.5 1.9 63.0 24 5,150 1.1Asgrow AG3034 3.0 PI 88788 3.1 17 40.0 1.8 63.0 24 1,775 0.4Pioneer P29T98R 2.9 PI 88788 1.7 17 38.5 1.5 62.8 26 2,225 1.4NK S32-L8 3.2 PI 88788 2.6 18 41.0 2.5 62.8 26 2,050 0.8JACOBSEN 942NR2 3.2 PI 88788 2.5 19 39.3 1.8 62.8 26 5,575 1.1Legend Seeds LS 28R20N 2.8 PI 88788 3.0 16 40.3 2.0 62.6 29 6,275 1.2MorSoy 36x63 3.6 PI 88788 2.7 26 44.3 1.6 62.5 30 3,075 0.64 STAR 2Y283 2.8 PI 88788/Peking 2.6 20 41.0 1.5 62.4 31 2,525 0.5HiSOY HS 33A32 3.3 PI 88788 2.1 24 38.0 1.5 62.4 31 2,800 0.4Legend Seeds LS 29R562N 2.9 PI 88788 3.3 16 41.0 2.1 62.4 31 2,925 0.6Stine 29RD22 2.9 PI 88788 1.9 18 42.8 2.4 61.4 34 2,400 0.5Prairie Brand PB-3699R2 3.6 PI 88788 2.6 26 44.0 2.0 60.9 35 3,175 1.1NK S35-A5 3.5 PI 88788 1.7 21 45.3 1.9 60.7 36 2,375 0.6JACOBSEN 838NR2 2.8 PI 88788 3.1 19 41.5 1.4 60.2 37 3,150 0.6Hoegemeyer HPT 3303NRR 3.3 PI 88788 3.0 18 42.5 2.0 60.1 38 3,000 0.7Curry 1311 3.1 PI 88788 3.4 16 38.8 1.5 59.8 39 2,300 0.8Asgrow AG3135 3.1 PI 88788 2.1 16 40.3 1.8 59.5 40 2,200 0.6Stine 38RE02 3.8 PI 88788 3.0 26 45.3 1.8 59.2 41 1,925 0.7Champion 30R84N 3.0 PI 88788/Peking 3.1 20 39.8 1.4 58.4 42 3,100 0.5Green Valley Seed GV344 3.4 PI 88788 2.7 22 41.0 2.5 57.9 44 2,275 0.5NuTech/G2 Genetics 7360 3.6 PI 88788 3.1 22 42.8 1.4 57.7 45 3,675 0.4Pioneer P33T89R 3.3 PI 88788 2.3 20 42.3 1.9 57.6 46 3,625 0.9Pioneer P39T67R 3.9 PI 88788 2.9 24 40.8 1.6 56.8 47 2,825 0.7Kruger K2-3502 3.5 PI 88788 2.7 21 40.0 1.8 54.7 50 3,550 1.2NK S31-R2 3.1 PI 88788 2.7 17 40.5 3.3 54.7 50 2,875 0.5Dairyland Seed DSR-3685/R2Y 3.6 PI 88788 3.5 20 43.0 2.4 53.8 52 4,025 1.3Merschman Eisenhower 1537RR2 3.7 PI 88788 2.8 24 42.0 1.5 53.3 53 3,975 0.7HiSOY HS 37A22 3.7 PI 88788 3.0 22 41.5 1.3 47.5 54 2,750 0.6

Mean 3.3 - 2.7 21 41.4 1.8 62.7 - 2,959 0.7LSD3 (P = 0.10) - - - - 2.9 0.4 9.0 - 1,985 -

NK S28-U7 2.8 None 2.3 15 37.5 1.6 58.4 42 4,450 1.3Pioneer 93Y52 3.5 None 3.1 23 38.5 1.5 55.3 48 4,000 0.6Pioneer 93M11 3.1 None 2.4 19 36.8 1.3 55.2 49 2,925 0.4


Figure 13. Pacific Junction (SW Iowa) Glyphosate-resistant.


0 10 20 30 40 50 60 70 80

Curry 1289Prairie Brand PB-3352R2

MorSoy 34x34Stine 37RC82

Dairyland Seed DSR-3313/R2YFederal Hybrids F285NRR2Y

Stine 32RF32Asgrow AG3334

LATHAM L3248R2Hoegemeyer HPT 2993NRR

LATHAM L3184R2Asgrow AG3735

LG Seeds C3070R2Kruger K2-3702

HiSOY HS 31A32Merschman Roosevelt 1535RR2

Pioneer P35T58RKruger K2-3204

NuTech/G2 Genetics 7357R2LG Seeds C3555R2

NuTech/G2 Genetics 7384NK S39-U2

Prairie Brand PB-3292R2Green Valley Seed GV374

Asgrow AG3034Pioneer P29T98R

NK S32-L8JACOBSEN 942NR2

Legend Seeds LS 28R20NMorSoy 36x63

4 STAR 2Y283HiSOY HS 33A32

Legend Seeds LS 29R562NStine 29RD22

Prairie Brand PB-3699R2NK S35-A5

JACOBSEN 838NR2Hoegemeyer HPT 3303NRR

Curry 1311Asgrow AG3135

Stine 38RE02Champion 30R84N

Green Valley Seed GV344NuTech/G2 Genetics 7360

Pioneer P33T89RPioneer P39T67RKruger K2-3502

NK S31-R2Dairyland Seed DSR-3685/R2Y

Merschman Eisenhower 1537RR2HiSOY HS 37A22

NK S28-U7

Pioneer 93Y52Pioneer 93M11



Table 14. Pacific Junction (SW Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

eMerge e3494 3.4 PI 88788 3.2 26 39.3 1.8 75.8 1 6,475 0.8LATHAM L2978L 2.9 PI 88788 3.0 18 39.0 1.6 72.7 2 6,950 0.7Merschman Madison 1539LL 3.9 PI 88788 3.1 27 42.3 1.8 71.0 3 7,975 1.0Merschman Grant 1536LL 3.6 PI 88788 2.8 22 41.0 1.8 70.6 4 11,075 1.5eMerge e3692S 3.6 PI 88788 2.5 22 41.3 1.8 68.9 5 7,025 1.3eMerge e3553 3.5 PI 88788 2.2 26 44.0 1.5 59.5 9 9,625 1.8

Mean 3.5 - 2.8 24 41.1 1.7 69.7 - 8,188 1.2LSD3 (P = 0.10) - - - - 1.5 NS 7.7 - NS -

Pioneer 93M11 3.1 None 2.4 19 36.3 1.1 65.6 6 12,800 1.5Pioneer 93Y52 3.5 None 3.1 26 37.5 1.5 65.5 7 10,300 1.4NK S28-U7 2.8 None 2.3 18 37.8 1.6 65.5 7 12,600 2.4

Mean 3.1 - 2.6 21 37.2 1.4 65.6 - 11,900 1.8

Figure 14. Pacific Junction (SW Iowa) Conventional.


0 10 20 30 40 50 60 70 80

eMerge e3494LAT HAM L2978L

Merschman Madison 1539LLMerschman Grant 1536LL

eMerge e3692SeMerge e3553

P ioneer 93M11Pioneer 93Y52

NK S28-U7




Table 15. Leighton (SC Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Prairie Brand PB-3699R2 3.6 PI 88788 2.6 26 34.8 1.8 55.0 1 550 0.8Pioneer P35T58R 3.5 PI 88788 3.0 21 39.0 1.6 50.6 2 250 0.5Asgrow AG3334 3.3 PI 88788 2.1 21 33.5 1.3 49.2 3 575 1.5Legend Seeds LS 28R20N 2.8 PI 88788 3.0 16 35.3 1.4 49.0 4 325 0.7Prairie Brand PB-3352R2 3.3 PI 88788 2.9 21 35.8 1.5 48.5 5 325 0.6Kruger K2-3702 3.7 PI 88788 2.9 27 35.3 1.5 48.3 6 700 1.0LG Seeds C3070R2 3.0 PI 88788 2.5 16 35.8 1.8 48.3 6 575 1.1Stine 37RC82 3.7 PI 88788 2.3 25 33.5 1.5 47.1 8 925 1.2HiSOY HS 31A32 3.1 PI 88788 3.3 19 32.5 1.4 47.1 8 925 2.2Stine 32RF32 3.2 PI 88788 2.9 20 33.8 1.6 46.6 10 525 0.8LG Seeds C3555R2 3.5 PI 88788 2.6 20 35.5 1.5 46.6 10 425 0.7Curry 1289 2.8 PI 88788 2.3 17 30.5 1.0 46.3 12 425 1.1Kruger K2-3204 3.2 PI 88788 2.1 23 38.5 1.1 45.5 13 1,800 2.1LATHAM L3184R2 3.1 PI 88788 3.3 18 28.8 1.5 45.5 13 325 0.8Legend Seeds LS 29R562N 2.9 PI 88788 3.3 16 34.5 1.6 45.2 15 600 0.8NK S32-L8 3.2 PI 88788 2.6 18 35.3 1.6 45.1 16 600 0.8LATHAM L3248R2 3.2 PI 88788 2.7 17 33.8 1.3 45.0 17 150 0.3Asgrow AG3034 3.0 PI 88788 3.1 17 34.0 1.4 44.7 18 475 1.0Federal Hybrids F285NRR2Y 2.8 PI 88788 2.3 15 30.3 1.3 43.9 19 600 0.64 STAR 2Y283 2.8 PI 88788/Peking 2.6 20 35.5 1.5 43.7 20 525 2.1NK S35-A5 3.5 PI 88788 1.7 21 42.3 1.6 43.7 20 400 0.8NuTech/G2 Genetics 7384 3.8 PI 88788 3.0 26 42.5 1.6 43.3 22 1,200 1.2Pioneer P29T98R 2.9 PI 88788 1.7 17 32.3 1.1 43.2 23 500 0.6Pioneer P33T89R 3.3 PI 88788 2.3 20 35.5 1.3 43.1 24 1,175 0.7Dairyland Seed DSR-3685/R2Y 3.6 PI 88788 3.5 20 37.5 1.8 43.1 24 375 0.4Prairie Brand PB-3292R2 3.2 PI 88788 2.6 19 35.3 1.5 43.0 26 225 0.5MorSoy 36x63 3.6 PI 88788 2.7 26 35.3 1.5 42.5 28 675 0.6Dairyland Seed DSR-3313/R2Y 3.3 PI 88788 2.7 20 32.8 1.4 42.2 29 1,375 1.3Green Valley Seed GV374 3.7 PI 88788 2.6 26 36.0 1.6 42.2 29 425 1.0NK S39-U2 3.9 PI 88788 3.0 26 36.5 1.8 42.1 31 125 0.1JACOBSEN 838NR2 2.8 PI 88788 3.1 19 34.8 1.4 42.1 31 850 1.7NuTech/G2 Genetics 7357R2 3.5 PI 88788 2.8 25 36.3 1.6 41.7 33 425 0.9Stine 29RD22 2.9 PI 88788 1.9 18 34.5 1.4 41.4 34 275 0.3HiSOY HS 33A32 3.3 PI 88788 2.1 24 32.3 1.4 41.4 34 900 1.1Champion 30R84N 3.0 PI 88788/Peking 3.1 20 37.3 1.4 41.3 36 325 0.3Asgrow AG3135 3.1 PI 88788 2.1 16 31.8 1.4 40.7 38 625 1.8Pioneer P39T67R 3.9 PI 88788 2.9 24 35.8 1.8 40.4 39 625 0.9Stine 38RE02 3.8 PI 88788 3.0 26 35.5 1.6 40.0 40 325 0.9Asgrow AG3735 3.7 PI 88788 2.8 24 31.5 1.4 39.8 41 350 0.3Curry 1311 3.1 PI 88788 3.4 16 32.3 1.3 39.6 42 175 0.5Hoegemeyer HPT 2993NRR 2.9 PI 88788 2.0 16 29.8 1.0 39.3 43 625 0.8Kruger K2-3502 3.5 PI 88788 2.7 21 34.5 1.5 39.2 44 250 0.6MorSoy 34x34 3.4 PI 88788 2.7 20 31.8 1.4 38.9 45 200 0.3Merschman Roosevelt 1535RR2 3.5 PI 88788 2.7 21 35.3 1.4 38.8 46 725 1.6JACOBSEN 942NR2 3.2 PI 88788 2.5 19 34.0 1.5 37.7 47 3,025 2.7Green Valley Seed GV344 3.4 PI 88788 2.7 22 34.0 1.5 37.7 47 1,225 0.8Hoegemeyer HPT 3303NRR 3.3 PI 88788 3.0 18 35.3 1.5 37.5 49 425 0.7Merschman Eisenhower 1537RR2 3.7 PI 88788 2.8 24 36.5 1.4 36.8 51 1,550 4.8NK S31-R2 3.1 PI 88788 2.7 17 33.8 2.1 32.6 52 475 0.7NuTech/G2 Genetics 7360 3.6 PI 88788 3.1 22 36.3 1.4 31.7 53 1,125 1.0HiSOY HS 37A22 3.7 PI 88788 3.0 22 36.8 1.3 25.1 54 500 0.8

Mean 3.3 - 2.7 21 34.7 1.5 42.6 - 649 1.0LSD3 (P = 0.10) - - - - 3.3 0.3 7.9 - 862 -

Pioneer 93M11 3.1 None 2.4 19 30.3 1.0 42.6 27 3,400 3.9NK S28-U7 2.8 None 2.3 15 34.0 1.4 41.2 37 1,550 3.3Pioneer 93Y52 3.5 None 3.1 23 32.8 1.1 37.4 50 2,775 3.6

Mean 3.1 - 2.6 19 32.4 1.2 40.4 - 2,575 3.6Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 697 eggs per 100 cc soil; HG Type 1.2.5.7 (37% on PI 88788, 10% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

Figure 15. Leighton (SC Iowa) Glyphosate-resistant.


0 10 20 30 40 50 60

Prairie Brand PB-3699R2Pioneer P35T58RAsgrow AG3334

Legend Seeds LS 28R20NPrairie Brand PB-3352R2

Kruger K2-3702LG Seeds C3070R2

Stine 37RC82HiSOY HS 31A32

Stine 32RF32LG Seeds C3555R2

Curry 1289Kruger K2-3204

LATHAM L3184R2Legend Seeds LS 29R562N

NK S32-L8LATHAM L3248R2

Asgrow AG3034Federal Hybrids F285NRR2Y

4 STAR 2Y283NK S35-A5

NuTech/G2 Genetics 7384Pioneer P29T98RPioneer P33T89R

Dairyland Seed DSR-3685/R2YPrairie Brand PB-3292R2

MorSoy 36x63Dairyland Seed DSR-3313/R2Y

Green Valley Seed GV374NK S39-U2

JACOBSEN 838NR2NuTech/G2 Genetics 7357R2

Stine 29RD22HiSOY HS 33A32Champion 30R84N

Asgrow AG3135Pioneer P39T67R

Stine 38RE02Asgrow AG3735

Curry 1311Hoegemeyer HPT 2993NRR

Kruger K2-3502MorSoy 34x34

Merschman Roosevelt 1535RR2JACOBSEN 942NR2

Green Valley Seed GV344Hoegemeyer HPT 3303NRR

Merschman Eisenhower 1537RR2NK S31-R2

NuTech/G2 Genetics 7360HiSOY HS 37A22

Pioneer 93M11

NK S28-U7Pioneer 93Y52


- Average initial SCN population density 697 eggs per 100 cc soil.- HG Type 1.2.5.7 (37% on PI 88788, 10% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Table 16. Leighton (SC Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

LATHAM L2978L 2.9 PI 88788 3.0 18 34.5 1.3 45.6 1 800 1.6Merschman Madison 1539LL 3.9 PI 88788 3.1 27 36.5 1.5 43.1 3 1,050 0.9Merschman Grant 1536LL 3.6 PI 88788 2.8 22 33.5 1.1 35.9 6 1,200 2.5eMerge e3692S 3.6 PI 88788 2.5 22 34.0 1.1 34.3 7 575 1.2eMerge e3494 3.4 PI 88788 3.2 26 32.0 1.0 31.1 8 1,100 0.7eMerge e3553 3.5 PI 88788 2.2 26 35.3 1.3 30.1 9 1,775 1.0

Mean 3.5 - 2.8 24 34.3 1.2 36.7 - 1,083 1.3LSD3 (P = 0.10) - - - - NS NS 6.4 - NS -


Mean 3.1 - 2.6 21 33.1 1.2 40.2 - 5,708 7.0

Figure 16. Leighton (SC Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 990 eggs per 100 cc soil; HG Type 1.2.5.7 (37% on PI 88788, 10% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50

LAT HAM L2978LMerschman Madison 1539LL

Merschman Grant 1536LLeMerge e3692SeMerge e3494eMerge e3553

P ioneer 93M11Pioneer 93Y52

NK S28-U7



- Average init ial SCN population density 990 eggs per 100 cc soil.- HG T ype 1.2.5.7 (37% on P I 88788, 10% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Table 17. Fruitland (SE Iowa) Glyphosate-resistant.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

Stine 32RF32 3.2 PI 88788 2.9 20 34.8 1.8 70.1 1 5,775 21.0Prairie Brand PB-3352R2 3.3 PI 88788 2.9 21 36.5 1.8 67.1 2 9,325 9.3LATHAM L3184R2 3.1 PI 88788 3.3 18 33.5 1.6 66.6 3 7,325 13.3MorSoy 36x63 3.6 PI 88788 2.7 26 37.8 1.8 65.7 4 6,050 7.8HiSOY HS 33A32 3.3 PI 88788 2.1 24 32.5 1.5 65.2 5 10,625 9.0Legend Seeds LS 29R562N 2.9 PI 88788 3.3 16 34.8 1.9 64.5 6 7,325 6.7Pioneer P35T58R 3.5 PI 88788 3.0 21 34.0 1.6 64.1 7 11,725 11.4Stine 37RC82 3.7 PI 88788 2.3 25 35.3 1.8 63.9 8 15,950 29.0Prairie Brand PB-3292R2 3.2 PI 88788 2.6 19 34.5 1.8 63.0 9 11,900 5.9Dairyland Seed DSR-3313/R2Y 3.3 PI 88788 2.7 20 36.3 1.8 63.0 9 13,700 13.0Green Valley Seed GV374 3.7 PI 88788 2.6 26 38.3 1.9 63.0 9 6,925 7.3NK S39-U2 3.9 PI 88788 3.0 26 37.0 2.4 62.9 12 10,350 14.8Kruger K2-3702 3.7 PI 88788 2.9 27 37.5 1.9 62.8 13 9,075 11.3Prairie Brand PB-3699R2 3.6 PI 88788 2.6 26 38.0 1.9 62.0 14 12,325 6.9Curry 1311 3.1 PI 88788 3.4 16 31.3 1.3 62.0 14 7,650 8.3Asgrow AG3334 3.3 PI 88788 2.1 21 33.8 1.3 62.0 14 12,300 9.3JACOBSEN 838NR2 2.8 PI 88788 3.1 19 33.5 1.5 61.7 17 11,925 10.8Green Valley Seed GV344 3.4 PI 88788 2.7 22 36.0 2.0 61.3 18 8,550 9.8Champion 30R84N 3.0 PI 88788/Peking 3.1 20 35.5 1.6 61.2 19 26,225 42.0HiSOY HS 31A32 3.1 PI 88788 3.3 19 31.5 1.4 61.1 20 12,300 10.3Merschman Roosevelt 1535RR2 3.5 PI 88788 2.7 21 33.8 1.9 61.0 21 14,525 11.6Curry 1289 2.8 PI 88788 2.3 17 28.5 1.1 60.8 22 9,550 4.4MorSoy 34x34 3.4 PI 88788 2.7 20 36.8 1.9 60.7 23 11,800 10.3Pioneer P39T67R 3.9 PI 88788 2.9 24 34.0 1.5 59.7 24 18,200 18.7NuTech/G2 Genetics 7357R2 3.5 PI 88788 2.8 25 37.3 2.0 59.6 25 14,175 19.6Asgrow AG3034 3.0 PI 88788 3.1 17 32.5 1.4 59.6 25 8,475 2.9Stine 38RE02 3.8 PI 88788 3.0 26 38.5 2.4 59.3 27 8,725 5.1Kruger K2-3502 3.5 PI 88788 2.7 21 37.0 1.6 59.0 28 8,400 16.8LG Seeds C3555R2 3.5 PI 88788 2.6 20 35.0 1.8 58.8 29 16,700 21.5LG Seeds C3070R2 3.0 PI 88788 2.5 16 32.0 1.6 58.4 30 13,000 11.6Legend Seeds LS 28R20N 2.8 PI 88788 3.0 16 32.8 1.4 57.8 31 19,175 13.7Kruger K2-3204 3.2 PI 88788 2.1 23 34.8 1.5 57.7 32 18,275 18.3Pioneer P29T98R 2.9 PI 88788 1.7 17 30.3 1.3 57.5 33 15,625 14.54 STAR 2Y283 2.8 PI 88788/Peking 2.6 20 34.8 1.5 56.9 34 8,275 10.0NK S32-L8 3.2 PI 88788 2.6 18 33.3 1.8 56.9 34 10,125 6.4NK S35-A5 3.5 PI 88788 1.7 21 38.5 1.6 56.9 34 11,175 9.3Federal Hybrids F285NRR2Y 2.8 PI 88788 2.3 15 27.3 1.0 56.5 37 7,075 5.8LATHAM L3248R2 3.2 PI 88788 2.7 17 32.8 1.4 56.2 38 16,225 18.0Pioneer P33T89R 3.3 PI 88788 2.3 20 34.3 1.5 55.3 39 11,050 7.9Asgrow AG3735 3.7 PI 88788 2.8 24 31.3 1.5 55.2 40 22,825 15.5NuTech/G2 Genetics 7384 3.8 PI 88788 3.0 26 38.5 1.5 55.1 41 22,175 16.7NK S31-R2 3.1 PI 88788 2.7 17 34.0 2.4 55.0 42 8,475 6.4Dairyland Seed DSR-3685/R2Y 3.6 PI 88788 3.5 20 35.3 1.8 54.9 43 7,150 5.3Hoegemeyer HPT 2993NRR 2.9 PI 88788 2.0 16 31.3 1.0 54.9 43 9,050 7.0Asgrow AG3135 3.1 PI 88788 2.1 16 29.8 1.3 54.7 45 14,925 14.9Hoegemeyer HPT 3303NRR 3.3 PI 88788 3.0 18 37.3 1.9 54.0 46 10,775 22.7Merschman Eisenhower 1537RR2 3.7 PI 88788 2.8 24 35.5 1.6 53.6 47 21,475 16.8Stine 29RD22 2.9 PI 88788 1.9 18 32.3 1.6 53.4 48 16,025 11.1NuTech/G2 Genetics 7360 3.6 PI 88788 3.1 22 36.8 1.5 51.9 49 13,725 16.6JACOBSEN 942NR2 3.2 PI 88788 2.5 19 30.8 1.4 49.9 50 51,475 34.3HiSOY HS 37A22 3.7 PI 88788 3.0 22 37.8 1.4 44.5 51 19,575 12.2

Mean 3.3 - 2.7 21 34.5 1.6 59.2 - 13,246 13.0LSD3 (P = 0.10) - - - - 2.9 0.3 5.9 - 12,871 -


Mean 3.1 - 2.6 19 27.5 1.1 38.3 - 32,100 55.2Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 1,138 eggs per 100 cc soil; HG Type 7 (8% on PI 88788, 0% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

Figure 17. Fruitland (SE Iowa) Glyphosate-resistant.

0 10 20 30 40 50 60 70 80 120

Stine 32RF32Prairie Brand PB-3352R2

LATHAM L3184R2MorSoy 36x63

HiSOY HS 33A32Legend Seeds LS 29R562N

Pioneer P35T58RStine 37RC82

Prairie Brand PB-3292R2Dairyland Seed DSR-3313/R2Y

Green Valley Seed GV374NK S39-U2

Kruger K2-3702Prairie Brand PB-3699R2

Curry 1311Asgrow AG3334

JACOBSEN 838NR2Green Valley Seed GV344

Champion 30R84NHiSOY HS 31A32

Merschman Roosevelt 1535RR2Curry 1289

MorSoy 34x34Pioneer P39T67R

NuTech/G2 Genetics 7357R2Asgrow AG3034

Stine 38RE02Kruger K2-3502

LG Seeds C3555R2LG Seeds C3070R2

Legend Seeds LS 28R20NKruger K2-3204

Pioneer P29T98R4 STAR 2Y283

NK S32-L8NK S35-A5

Federal Hybrids F285NRR2YLATHAM L3248R2

Pioneer P33T89RAsgrow AG3735

NuTech/G2 Genetics 7384NK S31-R2

Dairyland Seed DSR-3685/R2YHoegemeyer HPT 2993NRR

Asgrow AG3135Hoegemeyer HPT 3303NRR

Merschman Eisenhower 1537RR2Stine 29RD22

NuTech/G2 Genetics 7360JACOBSEN 942NR2

HiSOY HS 37A22

Pioneer 93M11Pioneer 93Y52

NK S28-U7



- Average initial SCN population density 1,138 eggs per 100 cc soil.- HG Type 7 (8% on PI 88788, 0% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Table 18. Fruitland (SE Iowa) Conventional.

Brand Variety

Relative m

aturity

Resistance

IDC

Maturity date

Height (inches)

Lodging (1-5)

Yield (bu/acre)

Yield rank

SCN

# (eggs/100cc) 1

RF

2

LATHAM L2978L 2.9 PI 88788 3.0 18 31.0 1.4 62.0 1 13,775 5.9Merschman Madison 1539LL 3.9 PI 88788 3.1 27 33.8 1.5 60.9 2 36,600 17.2eMerge e3494 3.4 PI 88788 3.2 26 29.3 1.6 47.2 3 28,100 15.8Merschman Grant 1536LL 3.6 PI 88788 2.8 22 32.0 1.3 46.7 4 35,325 11.6eMerge e3692S 3.6 PI 88788 2.5 22 30.3 1.3 45.3 5 24,025 7.5eMerge e3553 3.5 PI 88788 2.2 26 34.0 1.5 44.3 7 39,200 12.6

Mean 3.5 - 2.8 23 31.7 1.4 51.0 - 29,504 11.8LSD3 (P = 0.10) - - - - 2.9 0.2 5.8 - 11,432 -

Pioneer 93Y52 3.5 None 3.1 26 29.3 1.3 45.1 6 38,300 22.2Pioneer 93M11 3.1 None 2.4 19 27.5 1.0 41.2 8 58,875 22.9NK S28-U7 2.8 None 2.3 18 28.3 1.5 41.1 9 36,975 19.0

Mean 3.1 - 2.6 21 28.3 1.3 42.6 - 44,717 21.4

Figure 18. Fruitland (SE Iowa) Conventional.

Values presented in tables are means. Entries are listed in decreasing order of yield. Italicized entries are widely grown SCN-susceptible varieties entered by Iowa State University for comparison purposes. 1 Final SCN egg population density (eggs per 100 cc soil); there were no significant differences among initial SCN population densities; initial SCN population 2,313 eggs per 100 cc soil; HG Type 7 (8% on PI 88788, 0% on Peking). 2 Average final SCN egg population density / average initial SCN egg population density. 3 Least significant difference: values are from Fisher's least significant difference test, NS = no significant differences among the varieties.

0 10 20 30 40 50 60 70

LAT HAM L2978LMerschman Madison 1539LL

eMerge e3494Merschman Grant 1536LL

eMerge e3692SeMerge e3553

Pioneer 93Y52Pioneer 93M11

NK S28-U7



- Average init ial SCN population density 2,313 eggs per 100 cc soil.- HG T ype 7 (8% on PI 88788, 0% on Peking).- RF 1.0 = no change in SCN population density over growing season.

Table 19. Seed treatments used on varieties evaluated in 2014.Acceleron® CruiserMaxx®/Optimize® L-Coat/Excalibre™4 Star, ASGROW, Great Lakes Hybrids, Dairyland Seed Legacy Seeds Inc.Green Valley Seed, Kruger, Wensman

CruiserMaxx®/Vibrance™ PPST2030Bonus Coated +™ Cornelius, eMerge, NK, Prairie Brand PioneerMerschman

Curry Coat SmartCote™ ExtraCruiserMaxx® Curry NuTech/G2 GeneticsChampion, Federal Hybrids, HiSOY, Iowa StateUniversity, LATHAM, Legend Seeds, LG Seeds Gaucho®/Allegiance®/Evergol™ Trilex®/Allegiance®/Gaucho®NorthStar Genetics, MorSoy, Stine, Viking Hoegemeyer Jacobsen

Table 20. Contact information for companies represented in 2014 variety trials.Albert Lea Seed House (Viking) - Jake Hansen Hoegemeyer - Ryan Spurgeon MFA Incorporated (MorSoy) - Brian Andersonphone: 800-352-5247 phone: 800-245-4631 phone: 573-876-5363e-mail: [email protected] e-mail: [email protected] e-mail: [email protected]: www.alseed.com website: www.therightseed.com website: www.morsoy.com

Champion Seed - Rob Thomas GROWMARK (HiSOY) - Ken Martin Monsanto (Asgrow) - George Kadrmasphone: 515-836-2140 phone: 309-660-5576 phone: 319-350-0744e-mail: [email protected] e-mail: [email protected] e-mail: [email protected]: www.championseedofiowa.com website: www.fsseed.com/midwest website: www.asgrowanddekalb.com

Cornelius Seed - Will Cornelius Iowa State University - Greg Gebhart NorthStar Genetics - Bob Jacksonphone: 563-672-3463 phone: 515-294-5896 phone: 320-275-9373e-mail: [email protected] e-mail: [email protected] e-mail: [email protected]: www.corneliusseed.com website: www.northstargenetics.com

Jacobsen Hybrids - Larry NelsonCurry Seed - Eric Solberg phone: 712-665-2841 NuTech Seed, LLC (G2 Genetics) - Steve Sickphone: 605-356-3366 e-mail: [email protected] phone: 402-661-4700e-mail: [email protected] website: www.jacobsenseed.com e-mail: [email protected]: www.curryseed.com website:www.yieldleader.com

Kruger Seeds - Neal BorgmeyerDairyland Seed - Customer Service phone: 515-238-4572 Prairie Brand Seeds - Ben Fisherphone: 800-236-0163 e-mail: [email protected] phone: 800-544-8751e-mail: [email protected] website: www.krugerseed.com e-mail: [email protected]: www.dairylandseed.com website: www.prairiebrand.com

Latham Hi-Tech Seeds - Mark C. GrundmeierDuPont Pioneer - Scott Nelson phone: 800-798-3258 Schillinger Genetics (eMerge Genetics) -phone: 515-535-3939 e-mail: [email protected] Corey Nikkele-mail: [email protected] website: www.lathamseeds.com phone: 515-225-1166website: www.pioneer.com e-mail: [email protected]

Legacy Seeds Inc. - Bruce Ceranske website: www.grownongmo.comFederal Hybrids, Inc. - Kent Banwart phone: 866-791-6390phone: 515-887-5888 e-mail: [email protected] Stine Seed Company - Brian Hartmane-mail: [email protected] website: www.legacyseeds.com phone: 515-677-2605website: www.federalhybrids.com e-mail: [email protected]

Legend Seeds - Mike Knight website: www.stineseed.comFour Star Seed Company - Dennis Kenealy phone: 800-678-3346phone: 712-644-1400 e-mail: [email protected] Syngenta Seeds (NK) - Matt Polle-mail: [email protected] website: www.legendseeds.net phone: 319-330-8013website: www.4starseed.com e-mail: [email protected]

LG Seeds - Greg Peters website: www.nksoybeans.comGreat Lakes Hybrids - David Hoy phone: 515-370-3377phone: 319-240-9268 e-mail: [email protected] Wensman Seed Company - Kyle Kepnere-mail: [email protected] website: www.lgseeds.com phone: 320-760-4369website: www.greatlakeshybrids.com e-mail: [email protected]

Merschman Seeds, Inc. - Brian McKillip website: www.wensmanseed.comGreen Valley Seed, LLC - Jeff Dowdall phone: 319-837-6111phone: 800-748-7943 e-mail: [email protected]: [email protected] website: www.merschmanseeds.comwebsite: www.gvseed.com

… and justice for all The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or part of an individual’s income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at 202-720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue SW, Washington, DC 20250-9410, or call 800-795-3272 (voice) or 202-720-6382 (TDD). USDA is an equal opportunity provider and employer. Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Cathann A. Kress, director, Cooperative Extension Service, Iowa State University of Science and Technology, Ames, Iowa.

Evaluation of Soybean Varieties Resistant to Soybean Cyst ... ISU... · Roundup® herbicide, and...

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