Evaluation of Soybean Varieties Resistant to Soybean Cyst ......Each year, SCN-resistant soybean...

A supplement to Iowa Farmer Today.

Evaluation of Soybean Varieties Resistant to

Soybean Cyst Nematode in Iowa—2017

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 2017

View of the northeast Iowa location.

Evaluation of Soybean Varieties Resistant to Soybean Cyst Nematode in Iowa in 2017

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, 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

SCN-resistant soybeans were studied in northern, central, and southern Iowa based upon maturity group. The northern trials were located near Newell (northwest Iowa), Mason City (north central Iowa) and Lawler (northeast Iowa). The central trials were located near Moorhead (west central Iowa), Ames (central Iowa), and Urbana (east central Iowa). The southern trials were located near Glenwood (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 (PI 548402), and “2” indicates >10% reproduction on PI 88788. “-” indicates an incomplete HG type test; populations were tested only on Peking, PI 88788, PI 90763, and PI 437654.

SCN-susceptible varieties also were planted in the experiments for comparison purposes. All 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 encouraged to treat their seed with fungicide and insecticide. Seeds that were received untreated were treated with CruiserMaxx® by Iowa State University personnel. A complete list of the seed treatments used on the varieties tested is included at the end of the report. Pre-plant herbicides were applied to each location. Soybean varieties resistant/tolerant to glyphosate or glyphosate + dicamba were sprayed with glyphosate and Flexstar® to control weeds during the growing season. Varieties with glufosinate resistance/tolerance were sprayed with Flexstar®, FirstRate®, and Select Max® to control weeds during the growing season. The Moorhead and Lawler locations were planted using “no-till” methods. At all other locations, the seed bed was tilled prior to planting.

Location Initial SCN Population

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

Newell (NW) 862 2- May 30th October 17th Mason City (NC) 621 2- May 12th October 20th Lawler (NE) 2,087 2- May 15th October 19th Moorhead (WC) 1,039 2- May 8th October 23rd Ames (C) 1,828 2- May 31st October 26th Urbana (EC) 941 2- May 16th October 18th Glenwood (SW) 626 1.2- May 8th October 24th Leighton (SC) 783 1.2- May 5th October 25th Fruitland (SE) 969 2- May 3rd October 3rd

Herbicide resistance/tolerance of the SCN-resistant varieties tested.

District Glyphosate Glyphosate + dicamba Glufosinate Total

North 24 27 9 60 Central 25 26 8 59 South 19 32 8 59

At growth stage R6 all locations were scouted for foliar symptoms of sudden death syndrome (SDS). None of the locations had sufficient foliar disease to warrant rating the plots. All plots were end trimmed to a length of 14 feet during September. 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 high 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 1.1 and the susceptible variety scored an average of 3.5. The scores from these IDC field tests are listed in each location table in the report for reference.

Data Presentation In the report, soybean yield and SCN reproduction are displayed graphically in addition to numerically in the tables. Yield is represented by the length of the green bars. SCN reproduction is represented by the length of the blue bars. SCN reproduction was determined by calculating 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. 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. And an RF value of 0.5 means the SCN population density for those plots at harvest was one half the population density at planting. The RF value 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 solely 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 productivity of the land for soybean production in the future.

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). 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 resistance allow some limited reproduction of SCN. Resistant varieties must be used in an integrated management program, along with the use of nonhost crops, seed treatments, 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

Appreciation is expressed to the staff of the Iowa State University Research and Demonstration Farms. Gratitude also is expressed to Kermit Grote of Newell, Randy and Jess Lutz of Mason City, Donnie Blazek of Lawler, John Melby of Moorhead, Ed McKinley of Urbana, Matt Biermann of Glenwood, Mark Groenendyk of Leighton, and Ron Shepard of Fruitland for use of land for some of the experiments. Supported, in part, by soybean checkoff funds from the Iowa Soybean Association and also by the Iowa Agriculture and Home Economics Experiment Station.

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

Relative SCN #Brand Variety maturity Resistance IDC (eggs/100cc)1

Jacobsen 761NR2X 2.1 PI 88788 2.4 10,800 5.8 5.8 63.9 63.9Pioneer P21A28X 2.1 Peking 2.3 800 0.8 0.8 63.8 63.8Legacy Seeds LS-2037N RR2X 2.0 PI 88788 2.4 7,225 8.5 8.5 61.4 61.4Stine 21RI32 2.1 PI 88788 2.7 8,125 8.8 8.8 61.2 61.2Pioneer P19A14X 1.9 Peking 3.4 1,600 2.0 2.0 61.0 61.0Dyna-Gro S21XT77 2.1 PI 88788 2.8 8,700 13.4 13.4 60.8 60.8Pioneer P22T69R 2.2 Peking 2.3 775 0.7 0.7 60.6 60.6Cornelius CB22R88 2.2 PI 88788 2.2 6,450 10.3 10.3 60.5 60.5LG Seeds C2255R2 2.2 PI 88788 2.2 7,775 10.0 10.0 60.0 60.0Hoegemeyer HPT 2511 NRR 2.5 Peking 2.7 725 0.9 0.9 59.5 59.5ASGROW AG20X7 2.0 PI 88788 2.4 7,575 10.1 10.1 59.5 59.5Cornelius CB20R44 2.0 PI 88788 2.1 15,100 10.4 10.4 59.5 59.5Merschman Navaho 1820GT 2.0 PI 88788 3.0 8,350 5.8 5.8 59.4 59.4FS HiSOY 24X70 2.4 PI 88788 3.2 6,550 6.4 6.4 58.6 58.6ASGROW AG23X8 2.3 PI 88788 2.2 12,575 17.3 17.3 58.4 58.4NuTech 7198 1.9 Peking 2.2 1,100 2.1 2.1 58.3 58.3Pfister 18R201 1.8 PI 88788 3.1 10,100 7.6 7.6 58.0 58.0Prairie Brand PB-1947R2 1.9 PI 88788 3.1 6,850 13.7 13.7 58.0 58.0NK S21-W8X 2.1 PI 88788 2.5 6,175 10.7 10.7 58.0 58.0Dyna-Gro S23XT78 2.3 PI 88788 3.2 9,475 18.0 18.0 57.8 57.8DAIRYLAND SEED DSR-2330/R2Y 2.3 PI 88788 2.4 11,050 22.1 22.1 57.3 57.3NuTech 7224 2.2 Peking 2.8 1,825 2.6 2.6 57.3 57.3LATHAM L2368R2X 2.3 PI 88788 2.9 3,200 2.5 2.5 57.1 57.1Stine 19RF32 1.9 PI 88788 3.4 6,950 10.3 10.3 57.0 57.0Mycogen 5N194R2 1.9 PI 88788 3.3 13,425 13.1 13.1 57.0 57.04 STAR 3X240 2.4 PI 88788 3.4 5,950 6.1 6.1 56.9 56.9Stine 20RD20 2.0 PI 88788 2.6 7,450 11.0 11.0 56.3 56.3LATHAM L2228R2 2.2 PI 88788 2.3 7,825 6.3 6.3 56.2 56.2NK S20-J5X 2.0 PI 88788 2.5 9,500 11.2 11.2 56.0 56.0Cornelius CB19R71 1.9 PI 88788 3.4 5,050 4.4 4.4 55.9 55.9Merschman Apache 1823GT 2.3 PI 88788 1.9 7,775 5.6 5.6 55.7 55.7DAIRYLAND SEED DSR-2110/R2Y 2.1 PI 88788 2.6 5,650 5.8 5.8 55.3 55.3Prairie Brand PB-2197R2 2.1 PI 88788 2.5 6,475 5.8 5.8 55.1 55.1Legacy Seeds LS-1838N RR2X 1.8 PI 88788 1.9 7,775 6.0 6.0 55.0 55.0NK S18-G4X 1.8 PI 88788 2.3 7,100 3.4 3.4 55.0 55.0LG Seeds C2441R2 2.3 PI 88788 2.4 9,525 10.3 10.3 55.0 55.0Kruger K2X-2261 2.2 PI 88788 2.4 8,925 9.4 9.4 54.7 54.7ASGROW AG19X8 1.9 PI 88788 2.3 10,350 13.4 13.4 54.0 54.0Pioneer P16A35X 1.6 PI 88788 2.4 8,375 8.2 8.2 54.0 54.0Hoegemeyer HPT 2190 NR 2.1 PI 88788 3.4 8,000 9.7 9.7 53.8 53.8FS HiSOY 23X70 2.3 Peking 2.7 4,075 3.7 3.7 53.8 53.8Jacobsen 669NR2 19 PI 88788 3.2 7,075 6.3 6.3 53.2 53.2ASGROW AG17X8 1.7 PI 88788 2.6 7,225 6.9 6.9 53.0 53.0Pfister 20R23 2.0 PI 88788 2.4 10,900 5.6 5.6 52.7 52.7Wensman W1218NRX 2.1 PI 88788 3.0 7,450 14.2 14.2 52.7 52.7Dyna-Gro S20XT48 2.0 PI 88788 3.3 8,300 15.1 15.1 52.5 52.5FS HiSOY 25X70 2.5 PI 88788 3.0 7,825 9.8 9.8 52.1 52.1Federal Hybrids F2080N R2X 2.0 PI 88788 3.3 9,850 6.9 6.9 51.6 51.6Kruger K2X-1952 1.9 PI 88788 2.4 7,625 8.2 8.2 51.4 51.4Champion 20X98N 2.0 PI 88788 3.1 10,950 11.0 11.0 50.0 50.0Federal Hybrids F2280N R2X 2.2 PI 88788 2.3 13,450 19.2 19.2 47.8 47.8

Mean 2.4 - 2.7 7,524 8.6 56.5LSD3 (P = 0.10) - - - 4,601 - 5.6

NK S24-K2 2.4 None 2.6 20,675 18.0 18.0 46.3 46.3Kruger K2-2301 2.3 None 3.4 18,775 20.9 20.9 46.1 46.1Dyna-Gro 39RY25 2.5 None 3.6 18,150 22.0 22.0 41.7 41.7

Mean 2.4 - 3.2 19,200 20.3 44.7Values presented in tables are means. Entries are listed in decreasing order of yield.Italicized entries are widely available 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 975 eggs per 100 cc soil; HG type 2- (30% on PI 88788, 5% on Peking).2 Reproductive factor (RF) = average final SCN egg population density / average initial SCN egg population density; RF 1.0 = no change in SCN population density over growing season.3 Least significant difference: values are from Fisher's least-significant-difference test, NS = no significant differences among the varieties.

SCN RF2 Yield (bu/acre)

Table 2. Newell (NW Iowa) Non-glyphosate-treated.


NuTech 3174L 1.7 PI 88788 2.1 5,700 9.1 9.1 60.9 60.9Merschman Ute 1821LL 2.1 PI 88788 2.8 8,650 19.2 19.2 58.3 58.3LATHAM L1958L 1.9 PI 88788 2.4 4,175 7.0 7.0 57.0 57Merschman Chippewa 1523LL 2.3 PI 88788 3.1 12,750 39.2 39.2 56.7 56.7Merschman Osage 1824LL 2.4 PI 88788 2.6 8,750 19.4 19.4 56.5 56.5LATHAM L2358L 2.3 PI 88788 3.3 11,800 23.6 23.6 55.6 55.6Hoegemeyer HPT LL2300 N 2.3 PI 88788 2.8 9,025 21.2 21.2 55.2 55.2NuTech 3236L 2.3 PI 88788 3.4 8,600 14.3 14.3 54.4 54.4NuTech 3205L 2.0 PI 88788 3.2 5,675 6.9 6.9 53.7 53.7

Mean 2.1 - 2.9 8,347 17.8 56.5LSD3 (P = 0.10) - - - 5,122 - NS

Dyna-Gro 39RY25 2.5 None 3.6 13,950 24.3 24.3 51.1 51.1NK S24-K2 2.4 None 2.6 10,325 15.3 15.3 50.0 50.0Kruger K2-2301 2.3 None 3.4 14,000 16.5 16.5 49.0 49.0


Yield (bu/acre)SCN RF2

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


Stine 21RI32 2.1 PI 88788 2.7 1,425 4.8 4.8 72.7 72.7Jacobsen 669NR2 19 PI 88788 3.2 825 1.7 1.7 72.1 72.1Stine 20RD20 2.0 PI 88788 2.6 1,875 2.1 2.1 71.8 71.8Merschman Navaho 1820GT 2.0 PI 88788 3.0 1,675 2.2 2.2 71.7 71.7Stine 19RF32 1.9 PI 88788 3.4 1,500 1.4 1.4 71.6 71.6Pfister 18R201 1.8 PI 88788 3.1 1,450 1.6 1.6 71.6 71.6Legacy Seeds LS-2037N RR2X 2.0 PI 88788 2.4 1,350 3.0 3.0 71.5 71.5Wensman W1218NRX 2.1 PI 88788 3.0 1,800 1.8 1.8 71.5 71.5LG Seeds C2255R2 2.2 PI 88788 2.2 1,300 1.6 1.6 71.3 71.3Mycogen 5N194R2 1.9 PI 88788 3.3 2,050 3.9 3.9 71.1 71.1NK S20-J5X 2.0 PI 88788 2.5 925 1.2 1.2 70.9 70.9Prairie Brand PB-1947R2 1.9 PI 88788 3.1 1,075 2.9 2.9 70.8 70.8Prairie Brand PB-2197R2 2.1 PI 88788 2.5 1,625 0.9 0.9 70.8 70.8FS HiSOY 24X70 2.4 PI 88788 3.2 1,300 2.7 2.7 70.8 70.8Cornelius CB20R44 2.0 PI 88788 2.1 1,475 2.0 2.0 70.7 70.7ASGROW AG20X7 2.0 PI 88788 2.4 1,600 1.9 1.9 70.6 70.6DAIRYLAND SEED DSR-2330/R2Y 2.3 PI 88788 2.4 1,825 1.4 1.4 70.5 70.5Cornelius CB22R88 2.2 PI 88788 2.2 1,400 2.2 2.2 70.3 70.3NK S21-W8X 2.1 PI 88788 2.5 1,300 2.2 2.2 69.9 69.9ASGROW AG23X8 2.3 PI 88788 2.2 1,050 2.6 2.6 69.8 69.8LATHAM L2228R2 2.2 PI 88788 2.3 875 2.5 2.5 69.7 69.7Cornelius CB19R71 1.9 PI 88788 3.4 2,450 3.9 3.9 69.7 69.7LG Seeds C2441R2 2.3 PI 88788 2.4 1,325 1.5 1.5 69.5 69.5Pfister 20R23 2.0 PI 88788 2.4 2,175 7.9 7.9 69.1 69.1Pioneer P19A14X 1.9 Peking 3.4 850 0.9 0.9 69.1 69.1Dyna-Gro S21XT77 2.1 PI 88788 2.8 1,250 2.6 2.6 68.8 68.8Pioneer P21A28X 2.1 Peking 2.3 325 0.6 0.6 68.8 68.8ASGROW AG17X8 1.7 PI 88788 2.6 1,250 2.5 2.5 68.7 68.7Champion 20X98N 2.0 PI 88788 3.1 1,150 1.4 1.4 68.6 68.6Jacobsen 761NR2X 2.1 PI 88788 2.4 1,300 3.7 3.7 68.5 68.5Pioneer P22T69R 2.2 Peking 2.3 450 1.0 1.0 68.5 68.5LATHAM L2368R2X 2.3 PI 88788 2.9 1,150 3.5 3.5 68.3 68.3NuTech 7198 1.9 Peking 2.2 400 1.1 1.1 68.2 68.2NuTech 7224 2.2 Peking 2.8 700 0.9 0.9 68.2 68.2Hoegemeyer HPT 2190 NR 2.1 PI 88788 3.4 775 1.1 1.1 68.1 68.1ASGROW AG19X8 1.9 PI 88788 2.3 1,275 3.0 3.0 67.5 67.5Dyna-Gro S23XT78 2.3 PI 88788 3.2 1,050 3.2 3.2 67.3 67.3Legacy Seeds LS-1838N RR2X 1.8 PI 88788 1.9 1,025 1.4 1.4 66.4 66.4FS HiSOY 25X70 2.5 PI 88788 3.0 1,575 4.2 4.2 66.4 66.4DAIRYLAND SEED DSR-2110/R2Y 2.1 PI 88788 2.6 1,125 1.7 1.7 66.2 66.2Hoegemeyer HPT 2511 NRR 2.5 Peking 2.7 475 0.7 0.7 66.1 66.1Dyna-Gro S20XT48 2.0 PI 88788 3.3 1,525 1.9 1.9 66.0 66.0Federal Hybrids F2080N R2X 2.0 PI 88788 3.3 2,550 5.4 5.4 65.5 65.5Kruger K2X-2261 2.2 PI 88788 2.4 1,850 2.8 2.8 65.4 65.4NK S18-G4X 1.8 PI 88788 2.3 1,900 1.9 1.9 65.3 65.34 STAR 3X240 2.4 PI 88788 3.4 1,525 2.3 2.3 65.3 65.3FS HiSOY 23X70 2.3 Peking 2.7 1,800 4.0 4.0 65.2 65.2Merschman Apache 1823GT 2.3 PI 88788 1.9 1,375 1.8 1.8 64.1 64.1Pioneer P16A35X 1.6 PI 88788 2.4 1,050 2.1 2.1 64.0 64.0Federal Hybrids F2280N R2X 2.2 PI 88788 2.3 2,300 5.8 5.8 63.2 63.2Kruger K2X-1952 1.9 PI 88788 2.4 1,675 3.5 3.5 63.0 63.0

Mean 2.4 - 2.7 1,359 2.4 68.6LSD3 (P = 0.10) - - - 882 - 3.5

Dyna-Gro 39RY25 2.5 None 3.6 3,750 4.7 4.7 65.6 65.6Kruger K2-2301 2.3 None 3.4 4,075 9.6 9.6 61.8 61.8NK S24-K2 2.4 None 2.6 4,550 7.9 7.9 54.0 54.0



Table 4. Mason City (NC Iowa) Non-glyphosate-treated.


LATHAM L1958L 1.9 PI 88788 2.4 775 1.4 1.4 68.6 68.6NuTech 3174L 1.7 PI 88788 2.1 1,000 1.5 1.5 68.4 68.4Merschman Osage 1824LL 2.4 PI 88788 2.6 2,125 3.0 3.0 66.5 66.5NuTech 3236L 2.3 PI 88788 3.4 2,175 3.2 3.2 66.1 66.1Hoegemeyer HPT LL2300 N 2.3 PI 88788 2.8 4,200 6.7 6.7 64.8 64.8NuTech 3205L 2.0 PI 88788 3.2 1,475 3.9 3.9 63.8 63.8LATHAM L2358L 2.3 PI 88788 3.3 2,200 2.9 2.9 63.0 63Merschman Ute 1821LL 2.1 PI 88788 2.8 1,650 2.2 2.2 60.3 60.3Merschman Chippewa 1523LL 2.3 PI 88788 3.1 2,450 4.3 4.3 59.2 59.2

Mean 2.1 - 2.9 2,006 3.2 64.5LSD3 (P = 0.10) - - - NS - 4.4

Kruger K2-2301 2.3 None 3.4 2,775 4.0 4.0 63.9 63.9Dyna-Gro 39RY25 2.5 None 3.6 5,200 6.1 6.1 62.5 62.5NK S24-K2 2.4 None 2.6 4,375 6.3 6.3 54.8 54.8



Table 5. Lawler (NE Iowa) Glyphosate-treated.


LG Seeds C2255R2 2.2 PI 88788 2.2 600 0.2 0.2 62.6 62.6Pfister 18R201 1.8 PI 88788 3.1 1,050 0.3 0.3 62.5 62.5Pioneer P21A28X 2.1 Peking 2.3 550 0.2 0.2 62.2 62.2Prairie Brand PB-1947R2 1.9 PI 88788 3.1 550 0.3 0.3 61.8 61.8DAIRYLAND SEED DSR-2330/R2Y 2.3 PI 88788 2.4 950 0.5 0.5 60.9 60.9Jacobsen 669NR2 19 PI 88788 3.2 775 0.2 0.2 60.3 60.3Stine 21RI32 2.1 PI 88788 2.7 1,175 0.5 0.5 59.7 59.7ASGROW AG23X8 2.3 PI 88788 2.2 1,550 0.6 0.6 59.6 59.6LATHAM L2228R2 2.2 PI 88788 2.3 1,175 0.6 0.6 59.4 59.4NK S20-J5X 2.0 PI 88788 2.5 1,200 0.6 0.6 59.4 59.4Pioneer P22T69R 2.2 Peking 2.3 300 0.2 0.2 59.4 59.4Legacy Seeds LS-1838N RR2X 1.8 PI 88788 1.9 775 0.4 0.4 59.1 59.1Federal Hybrids F2280N R2X 2.2 PI 88788 2.3 1,300 0.7 0.7 59.0 59.0NK S21-W8X 2.1 PI 88788 2.5 1,450 0.4 0.4 58.9 58.9Stine 20RD20 2.0 PI 88788 2.6 875 0.3 0.3 58.7 58.7Jacobsen 761NR2X 2.1 PI 88788 2.4 950 0.3 0.3 58.7 58.7Stine 19RF32 1.9 PI 88788 3.4 1,000 0.7 0.7 58.0 58.0Legacy Seeds LS-2037N RR2X 2.0 PI 88788 2.4 1,525 0.5 0.5 57.9 57.9Wensman W1218NRX 2.1 PI 88788 3.0 1,025 0.6 0.6 57.9 57.94 STAR 3X240 2.4 PI 88788 3.4 1,225 0.7 0.7 57.6 57.6Prairie Brand PB-2197R2 2.1 PI 88788 2.5 1,425 0.7 0.7 57.5 57.5LG Seeds C2441R2 2.3 PI 88788 2.4 1,150 0.9 0.9 57.5 57.5Merschman Navaho 1820GT 2.0 PI 88788 3.0 2,050 0.7 0.7 57.4 57.4Mycogen 5N194R2 1.9 PI 88788 3.3 800 0.5 0.5 57.1 57.1ASGROW AG19X8 1.9 PI 88788 2.3 950 0.2 0.2 57.1 57.1Pioneer P16A35X 1.6 PI 88788 2.4 1,625 0.5 0.5 57.1 57.1NuTech 7198 1.9 Peking 2.2 600 0.3 0.3 57.1 57.1FS HiSOY 24X70 2.4 PI 88788 3.2 650 0.3 0.3 57.0 57.0Pfister 20R23 2.0 PI 88788 2.4 1,175 0.6 0.6 56.8 56.8Cornelius CB22R88 2.2 PI 88788 2.2 900 0.3 0.3 56.8 56.8Champion 20X98N 2.0 PI 88788 3.1 1,075 0.8 0.8 56.5 56.5Hoegemeyer HPT 2190 NR 2.1 PI 88788 3.4 600 0.2 0.2 56.4 56.4LATHAM L2368R2X 2.3 PI 88788 2.9 1,075 0.5 0.5 56.2 56.2NK S18-G4X 1.8 PI 88788 2.3 775 0.4 0.4 56.2 56.2Cornelius CB19R71 1.9 PI 88788 3.4 850 0.6 0.6 56.1 56.1Cornelius CB20R44 2.0 PI 88788 2.1 1,000 0.5 0.5 55.9 55.9Hoegemeyer HPT 2511 NRR 2.5 Peking 2.7 875 0.5 0.5 55.3 55.3ASGROW AG17X8 1.7 PI 88788 2.6 1,350 0.7 0.7 55.3 55.3Dyna-Gro S20XT48 2.0 PI 88788 3.3 825 0.5 0.5 55.0 55.0ASGROW AG20X7 2.0 PI 88788 2.4 725 0.3 0.3 55.0 55.0NuTech 7224 2.2 Peking 2.8 750 0.4 0.4 55.0 55.0Federal Hybrids F2080N R2X 2.0 PI 88788 3.3 1,325 0.9 0.9 54.9 54.9Dyna-Gro S21XT77 2.1 PI 88788 2.8 1,125 0.7 0.7 54.6 54.6Kruger K2X-1952 1.9 PI 88788 2.4 1,025 0.7 0.7 54.6 54.6Merschman Apache 1823GT 2.3 PI 88788 1.9 1,300 0.5 0.5 54.4 54.4Kruger K2X-2261 2.2 PI 88788 2.4 1,925 1.0 1.0 53.9 53.9Dyna-Gro S23XT78 2.3 PI 88788 3.2 1,200 0.4 0.4 53.8 53.8FS HiSOY 23X70 2.3 Peking 2.7 900 0.3 0.3 53.8 53.8Pioneer P19A14X 1.9 Peking 3.4 925 0.6 0.6 53.3 53.3FS HiSOY 25X70 2.5 PI 88788 3.0 2,125 0.6 0.6 52.8 52.8DAIRYLAND SEED DSR-2110/R2Y 2.1 PI 88788 2.6 775 0.4 0.4 48.8 48.8

Mean 2.4 - 2.7 1,056 0.5 57.1LSD3 (P = 0.10) - - - NS - 4.9


Mean 2.4 - 3.2 3,717 1.5 51.6Values presented in tables are means. Entries are listed in decreasing order of yield.Italicized entries are widely available 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 2,295 eggs per 100 cc soil; HG type 2- (35% on PI 88788, 1% on Peking).2 Reproductive factor (RF) = average final SCN egg population density / average initial SCN egg population density; RF 1.0 = no change in SCN population density over growing season.3 Least significant difference: values are from Fisher's least-significant-difference test, NS = no significant differences among the varieties.


Table 6. Lawler (NE Iowa) Non-glyphosate-treated.

Relative SCN #Brand Variety maturity Resistance IDC (eggs/100cc)1 SCN RF2

Merschman Osage 1824LL 2.4 PI 88788 2.6 1,175 0.8 0.8 51.3 51.3NuTech 3174L 1.7 PI 88788 2.1 725 0.4 0.4 49.8 49.8NuTech 3236L 2.3 PI 88788 3.4 1,950 1.3 1.3 49.0 49.0Hoegemeyer HPT LL2300 N 2.3 PI 88788 2.8 1,800 1.2 1.2 48.1 48.1LATHAM L2358L 2.3 PI 88788 3.3 1,225 0.6 0.6 46.8 46.8Merschman Chippewa 1523LL 2.3 PI 88788 3.1 2,325 1.0 1.0 46.3 46.3LATHAM L1958L 1.9 PI 88788 2.4 300 0.3 0.3 43.4 43.4NuTech 3205L 2.0 PI 88788 3.2 475 0.4 0.4 43.0 43Merschman Ute 1821LL 2.1 PI 88788 2.8 1,300 1.0 1.0 36.1 36.1

Mean 2.1 - 2.9 1,253 0.8 46.0LSD3 (P = 0.10) - - - 720 - 5.5

NK S24-K2 2.4 None 2.6 2,550 1.2 1.2 44.6 44.6Kruger K2-2301 2.3 None 3.4 1,275 0.9 0.9 42.9 42.9Dyna-Gro 39RY25 2.5 None 3.6 4,425 2.6 2.6 42.3 42.3


Yield (bu/acre)

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


Pioneer P25A70R 2.5 Peking 2.5 425 0.4 0.4 81.3 81.3NuTech 7279 2.7 PI 88788 2.4 2,400 1.5 1.5 81.1 81.1NK S33-T8X 3.3 PI 88788 2.4 2,875 3.0 3.0 79.5 79.5Federal Hybrids F2480N R2X 2.4 PI 88788 3.0 1,100 1.1 1.1 79.4 79.4NK S27-M8X 2.7 PI 88788 3.1 3,350 2.7 2.7 78.5 78.5LG Seeds C2888RX 2.8 PI 88788 3.7 1,950 2.2 2.2 78.3 78.3Prairie Brand PB-2486R2 2.4 PI 88788 2.6 2,950 3.8 3.8 78.1 78.1Pioneer P24T93R 2.4 PI 88788 2.2 1,500 1.7 1.7 78.1 78.1Stine 21RI32 2.1 PI 88788 2.3 2,375 2.8 2.8 77.6 77.6ASGROW AG26X8 2.6 PI 88788 3.4 2,475 1.7 1.7 76.6 76.6Champion 24R87N 2.4 PI 88788 2.3 1,075 1.2 1.2 76.5 76.5Legacy Seeds LS-2638N RR2X 2.6 PI 88788 3.4 1,000 1.3 1.3 76.4 76.4Cornelius CB22R88 2.2 PI 88788 2.4 1,100 2.1 2.1 76.2 76.2Dyna-Gro S28XT58 2.8 PI 88788 3.2 1,250 2.3 2.3 76.1 76.1Hoegemeyer HPT 2721 NR 2.7 PI 88788 2.9 3,575 2.2 2.2 76.0 76.0FS HiSOY 28X70 2.8 PI 88788 3.1 1,125 1.0 1.0 75.7 75.7DAIRYLAND SEED DSR-3028/R2Y 3.0 PI 88788 3.2 1,600 1.4 1.4 75.5 75.5Pfister 24R201 2.4 PI 88788 2.5 2,450 1.8 1.8 75.1 75.1Mycogen 5N287R2 2.8 PI 88788 2.6 2,550 3.0 3.0 75.1 75.1Stine 26XB32 2.6 PI 88788 3.1 850 1.1 1.1 75.0 75.0Stine 24RH62 2.4 PI 88788 2.4 2,350 1.4 1.4 74.9 74.9LG Seeds C2520R2 2.5 PI 88788 2.2 2,900 1.9 1.9 74.7 74.7Cornelius CB24R82 2.4 PI 88788 2.6 2,425 2.0 2.0 74.6 74.6Hoegemeyer HPT 2811 NR 2.8 PI 88788 2.6 2,550 2.0 2.0 74.5 74.5Jacobsen 774NR2X 2.4 PI 88788 3.1 1,000 1.3 1.3 74.3 74.3NuTech 7240 2.4 Peking 2.6 625 1.0 1.0 74.3 74.3NK S29-K3X 2.9 PI 88788 2.3 2,050 1.7 1.7 74.1 74.1Pioneer P24A99X 2.4 PI 88788 2.2 3,075 2.3 2.3 74.0 74.0Dyna-Gro S26RS75 2.6 PI 88788 2.4 2,275 2.7 2.7 73.8 73.8Jacobsen 876NR2X 2.6 PI 88788 3.1 1,175 0.8 0.8 73.7 73.7Stine 27RIO2 2.7 PI 88788 2.9 2,800 2.1 2.1 73.5 73.5Kruger K2X-2863 2.8 PI 88788 3.4 2,050 2.3 2.3 73.4 73.4Federal Hybrids F2880N R2X 2.8 PI 88788 3.6 3,300 2.0 2.0 73.1 73.1LATHAM L2682R2X 2.6 PI 88788 3.3 2,000 1.4 1.4 72.7 72.7LATHAM L3184R2 3.1 PI 88788 3.6 3,100 3.1 3.1 72.7 72.7Merschman Mohawk 1825GT 2.5 PI 88788 3.1 2,750 1.7 1.7 72.7 72.7Pfister 26R207 2.6 PI 88788 3.1 2,300 3.0 3.0 71.9 71.9DAIRYLAND SEED DSR-2909/R2Y 2.9 PI 88788 2.4 2,475 2.9 2.9 71.9 71.9Pioneer P28T08R 2.8 PI 88788 2.9 1,950 2.4 2.4 71.2 71.2ASGROW AG29X8 2.9 PI 88788 3.2 4,375 2.7 2.7 70.9 70.9ASGROW AG24X7 2.4 PI 88788 3.4 2,200 2.8 2.8 70.6 70.6Merschman Shawnee 1826GT 2.6 PI 88788 2.2 2,050 2.6 2.6 70.2 70.2NK S21-W8X 2.1 PI 88788 2.6 1,425 1.3 1.3 70.1 70.1Wensman W1220NRX 2.2 PI 88788 2.4 2,450 2.5 2.5 69.6 69.6Prairie Brand PB-2876R2 2.8 PI 88788 3.1 4,250 3.3 3.3 69.4 69.4FS HiSOY 31X60 3.1 PI 88788 2.7 5,125 3.0 3.0 69.4 69.4ASGROW AG27X7 2.7 PI 88788 3.4 2,100 2.0 2.0 67.7 67.7Pioneer P31A22X 3.1 PI 88788 2.8 1,250 0.9 0.9 67.3 67.3FS HiSOY 29X70 2.9 PI 88788 3.0 2,275 2.0 2.0 67.1 67.14 STAR 3X300 3.0 PI 88788 2.9 2,025 2.5 2.5 64.6 64.6ASGROW AG30X8 3.0 PI 88788 3.4 2,325 1.3 1.3 62.8 62.8

Mean 2.7 - 2.8 2,215 2.0 73.8LSD3 (P = 0.10) - - - 1,583 - 4.9




Table 8. Moorhead (WC Iowa) Non-glyphosate-treated.


LATHAM L3187L 3.1 PI 88788 3.3 2,250 3.6 3.6 74.1 74.1NuTech 3309L 3.0 PI 88788 3.5 2,025 2.1 2.1 73.8 73.8LATHAM L2684L 2.6 PI 88788 2.2 3,575 4.9 4.9 72.4 72.4NuTech 3252L 2.5 PI 88788 2.1 3,325 3.2 3.2 69.9 69.9Champion 26L16N 2.6 PI 88788 2.3 3,875 6.5 6.5 69.6 69.6Hoegemeyer HPT LL2877 2.8 PI 88788 2.8 1,600 1.3 1.3 69.1 69.1NuTech 3236L 2.3 PI 88788 3.3 13,000 10.8 10.8 68.9 68.9Hoegemeyer HPT LL2599 2.5 PI 88788 2.3 4,800 5.8 5.8 68.8 68.8

Mean 2.7 - 2.7 4,306 4.8 70.8LSD3 (P = 0.10) - - - 3,149 - 2.8




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


Pioneer P31A22X 3.1 PI 88788 2.8 2,875 1.1 1.1 73.4 73.4Federal Hybrids F2480N R2X 2.4 PI 88788 3.0 1,900 1.0 1.0 73.1 73.1Jacobsen 774NR2X 2.4 PI 88788 3.1 3,900 2.2 2.2 71.7 71.7NK S27-M8X 2.7 PI 88788 3.1 2,425 0.9 0.9 71.3 71.3Mycogen 5N287R2 2.8 PI 88788 2.6 2,100 1.1 1.1 70.9 70.9LATHAM L3184R2 3.1 PI 88788 3.6 3,750 2.1 2.1 70.5 70.5Hoegemeyer HPT 2721 NR 2.7 PI 88788 2.9 3,750 2.6 2.6 70.3 70.3LG Seeds C2520R2 2.5 PI 88788 2.2 2,725 1.3 1.3 70.0 70.0Stine 27RIO2 2.7 PI 88788 2.9 2,000 1.3 1.3 69.9 69.9Stine 21RI32 2.1 PI 88788 2.3 2,375 1.0 1.0 69.7 69.7Champion 24R87N 2.4 PI 88788 2.3 2,200 1.3 1.3 69.7 69.7Federal Hybrids F2880N R2X 2.8 PI 88788 3.6 1,850 1.2 1.2 69.6 69.6Cornelius CB22R88 2.2 PI 88788 2.4 2,250 1.4 1.4 69.6 69.6Stine 24RH62 2.4 PI 88788 2.4 3,100 1.7 1.7 69.4 69.4NK S21-W8X 2.1 PI 88788 2.6 1,800 0.9 0.9 69.3 69.3Pioneer P24T93R 2.4 PI 88788 2.2 1,125 0.6 0.6 68.7 68.7LG Seeds C2888RX 2.8 PI 88788 3.7 2,350 1.7 1.7 68.6 68.6Pioneer P28T08R 2.8 PI 88788 2.9 1,700 0.9 0.9 68.5 68.5Dyna-Gro S28XT58 2.8 PI 88788 3.2 2,225 1.7 1.7 68.4 68.4NK S33-T8X 3.3 PI 88788 2.4 3,875 1.9 1.9 68.4 68.4DAIRYLAND SEED DSR-2909/R2Y 2.9 PI 88788 2.4 2,350 1.0 1.0 68.1 68.1NuTech 7279 2.7 PI 88788 2.4 1,700 1.1 1.1 68.1 68.1ASGROW AG29X8 2.9 PI 88788 3.2 2,625 0.9 0.9 68.0 68.0Stine 26XB32 2.6 PI 88788 3.1 3,525 1.7 1.7 67.9 67.9Pioneer P25A70R 2.5 Peking 2.5 1,300 0.9 0.9 67.9 67.9NuTech 7240 2.4 Peking 2.6 1,400 0.5 0.5 67.9 67.9Prairie Brand PB-2876R2 2.8 PI 88788 3.1 3,550 1.3 1.3 67.8 67.8Legacy Seeds LS-2638N RR2X 2.6 PI 88788 3.4 1,625 0.7 0.7 67.7 67.7ASGROW AG30X8 3.0 PI 88788 3.4 3,550 1.3 1.3 67.7 67.7Pfister 24R201 2.4 PI 88788 2.5 2,600 1.3 1.3 67.6 67.6ASGROW AG24X7 2.4 PI 88788 3.4 2,300 1.0 1.0 67.6 67.6Wensman W1220NRX 2.2 PI 88788 2.4 2,500 1.2 1.2 67.5 67.5FS HiSOY 28X70 2.8 PI 88788 3.1 1,925 1.1 1.1 67.5 67.5FS HiSOY 31X60 3.1 PI 88788 2.7 5,400 2.1 2.1 67.3 67.3Prairie Brand PB-2486R2 2.4 PI 88788 2.6 1,775 1.5 1.5 67.1 67.1Kruger K2X-2863 2.8 PI 88788 3.4 3,850 1.7 1.7 67.0 67.0DAIRYLAND SEED DSR-3028/R2Y 3.0 PI 88788 3.2 3,850 1.7 1.7 66.9 66.9Cornelius CB24R82 2.4 PI 88788 2.6 3,775 3.0 3.0 66.9 66.9NK S29-K3X 2.9 PI 88788 2.3 2,825 1.5 1.5 66.7 66.7Jacobsen 876NR2X 2.6 PI 88788 3.1 1,475 0.9 0.9 66.5 66.5Pioneer P24A99X 2.4 PI 88788 2.2 2,550 2.3 2.3 66.5 66.5FS HiSOY 29X70 2.9 PI 88788 3.0 1,450 1.3 1.3 66.4 66.44 STAR 3X300 3.0 PI 88788 2.9 1,775 0.7 0.7 66.2 66.2LATHAM L2682R2X 2.6 PI 88788 3.3 1,600 0.8 0.8 65.6 65.6Merschman Mohawk 1825GT 2.5 PI 88788 3.1 2,500 1.1 1.1 65.5 65.5Hoegemeyer HPT 2811 NR 2.8 PI 88788 2.6 4,550 2.9 2.9 65.0 65.0Dyna-Gro S26RS75 2.6 PI 88788 2.4 3,175 1.8 1.8 64.9 64.9ASGROW AG26X8 2.6 PI 88788 3.4 3,925 2.3 2.3 64.7 64.7ASGROW AG27X7 2.7 PI 88788 3.4 3,300 0.8 0.8 63.8 63.8Merschman Shawnee 1826GT 2.6 PI 88788 2.2 1,375 0.7 0.7 63.6 63.6Pfister 26R207 2.6 PI 88788 3.1 3,325 1.8 1.8 62.9 62.9

Mean 2.7 - 2.8 2,622 1.4 68.0LSD3 (P = 0.10) - - - 1,922 - 3.6

NK S24-K2 2.4 None 2.6 12,225 6.0 6.0 61.3 61.3Dyna-Gro 39RY25 2.5 None 3.6 14,750 7.0 7.0 56.3 56.3Kruger K2-2301 2.3 None 3.4 7,600 4.3 4.3 53.8 53.8



Table 10. Ames (C Iowa) Non-glyphosate-treated.


NuTech 3309L 3.0 PI 88788 3.5 2,400 1.7 1.7 67.3 67.3LATHAM L2684L 2.6 PI 88788 2.2 5,375 4.8 4.8 65.5 65.5LATHAM L3187L 3.1 PI 88788 3.3 3,000 2.4 2.4 65.3 65.3Hoegemeyer HPT LL2877 2.8 PI 88788 2.8 4,375 4.3 4.3 65.1 65.1Champion 26L16N 2.6 PI 88788 2.3 5,500 3.9 3.9 64.7 64.7NuTech 3252L 2.5 PI 88788 2.1 5,250 5.1 5.1 64.5 64.5Hoegemeyer HPT LL2599 2.5 PI 88788 2.3 4,625 2.5 2.5 63.9 63.9NuTech 3236L 2.3 PI 88788 3.3 16,025 10.9 10.9 54.0 54

Mean 2.7 - 2.7 5,819 4.4 63.8LSD3 (P = 0.10) - - - 3,362 - 4.5




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


Jacobsen 774NR2X 2.4 PI 88788 3.1 2,275 2.2 2.2 73.2 73.2Pfister 24R201 2.4 PI 88788 2.5 2,075 2.4 2.4 70.5 70.5Cornelius CB24R82 2.4 PI 88788 2.6 1,550 1.9 1.9 69.9 69.9Federal Hybrids F2480N R2X 2.4 PI 88788 3.0 1,950 1.1 1.1 69.8 69.8Mycogen 5N287R2 2.8 PI 88788 2.6 2,500 2.9 2.9 69.5 69.5NK S21-W8X 2.1 PI 88788 2.6 2,850 2.3 2.3 69.3 69.3Pioneer P24A99X 2.4 PI 88788 2.2 1,800 2.8 2.8 68.4 68.4Stine 21RI32 2.1 PI 88788 2.3 2,575 1.8 1.8 68.2 68.2Prairie Brand PB-2486R2 2.4 PI 88788 2.6 2,400 2.6 2.6 68.1 68.1LG Seeds C2520R2 2.5 PI 88788 2.2 3,650 4.1 4.1 68.1 68.1Merschman Shawnee 1826GT 2.6 PI 88788 2.2 2,225 2.4 2.4 67.9 67.9Dyna-Gro S26RS75 2.6 PI 88788 2.4 2,400 3.2 3.2 67.9 67.9Cornelius CB22R88 2.2 PI 88788 2.4 3,200 2.3 2.3 67.9 67.9Stine 24RH62 2.4 PI 88788 2.4 2,200 4.2 4.2 67.8 67.8Stine 27RIO2 2.7 PI 88788 2.9 3,475 3.0 3.0 67.8 67.8Merschman Mohawk 1825GT 2.5 PI 88788 3.1 1,325 2.1 2.1 67.8 67.8Hoegemeyer HPT 2721 NR 2.7 PI 88788 2.9 2,475 2.5 2.5 67.6 67.6ASGROW AG24X7 2.4 PI 88788 3.4 2,000 1.5 1.5 67.0 67.0NK S27-M8X 2.7 PI 88788 3.1 1,600 2.7 2.7 66.9 66.9Pioneer P25A70R 2.5 Peking 2.5 2,600 2.3 2.3 66.6 66.6Legacy Seeds LS-2638N RR2X 2.6 PI 88788 3.4 1,425 2.3 2.3 66.5 66.5Champion 24R87N 2.4 PI 88788 2.3 2,175 2.5 2.5 66.4 66.4ASGROW AG26X8 2.6 PI 88788 3.4 3,375 1.9 1.9 66.4 66.4NuTech 7240 2.4 Peking 2.6 1,475 1.6 1.6 66.3 66.3Pioneer P24T93R 2.4 PI 88788 2.2 2,250 2.8 2.8 65.9 65.9LG Seeds C2888RX 2.8 PI 88788 3.7 4,350 4.0 4.0 65.8 65.8FS HiSOY 28X70 2.8 PI 88788 3.1 1,200 1.2 1.2 65.7 65.7Pioneer P28T08R 2.8 PI 88788 2.9 3,500 2.1 2.1 65.7 65.7Wensman W1220NRX 2.2 PI 88788 2.4 1,675 1.9 1.9 65.6 65.6Pioneer P31A22X 3.1 PI 88788 2.8 2,350 2.3 2.3 65.3 65.3LATHAM L2682R2X 2.6 PI 88788 3.3 2,100 2.5 2.5 65.0 65.0Stine 26XB32 2.6 PI 88788 3.1 2,200 4.2 4.2 64.9 64.9Hoegemeyer HPT 2811 NR 2.8 PI 88788 2.6 2,425 1.9 1.9 64.9 64.9Federal Hybrids F2880N R2X 2.8 PI 88788 3.6 1,750 1.0 1.0 64.7 64.7Jacobsen 876NR2X 2.6 PI 88788 3.1 2,325 1.9 1.9 64.7 64.7Pfister 26R207 2.6 PI 88788 3.1 2,050 3.3 3.3 64.6 64.6Dyna-Gro S28XT58 2.8 PI 88788 3.2 1,400 2.2 2.2 64.6 64.6NuTech 7279 2.7 PI 88788 2.4 1,725 4.3 4.3 64.3 64.3DAIRYLAND SEED DSR-2909/R2Y 2.9 PI 88788 2.4 3,525 2.1 2.1 63.9 63.9ASGROW AG27X7 2.7 PI 88788 3.4 1,475 1.2 1.2 62.7 62.7NK S33-T8X 3.3 PI 88788 2.4 2,050 2.7 2.7 61.7 61.7FS HiSOY 31X60 3.1 PI 88788 2.7 4,875 2.7 2.7 61.7 61.7NK S29-K3X 2.9 PI 88788 2.3 2,750 2.2 2.2 61.3 61.3Prairie Brand PB-2876R2 2.8 PI 88788 3.1 3,600 11.1 11.1 60.1 60.1Kruger K2X-2863 2.8 PI 88788 3.4 3,275 2.7 2.7 59.8 59.8ASGROW AG30X8 3.0 PI 88788 3.4 1,675 1.6 1.6 59.6 59.6LATHAM L3184R2 3.1 PI 88788 3.6 2,725 1.7 1.7 59.3 59.3ASGROW AG29X8 2.9 PI 88788 3.2 1,400 1.8 1.8 59.0 59.04 STAR 3X300 3.0 PI 88788 2.9 2,600 1.9 1.9 58.7 58.7FS HiSOY 29X70 2.9 PI 88788 3.0 1,275 2.8 2.8 56.3 56.3DAIRYLAND SEED DSR-3028/R2Y 3.0 PI 88788 3.2 2,400 1.9 1.9 56.1 56.1

Mean 2.7 - 2.8 2,363 2.6 65.2LSD3 (P = 0.10) - - - NS - 4.2

NK S24-K2 2.4 None 2.6 22,350 28.8 28.8 50.2 50.2Dyna-Gro 39RY25 2.5 None 3.6 17,125 9.4 9.4 47.6 47.6Kruger K2-2301 2.3 None 3.4 18,125 11.3 11.3 44.5 44.5



Table 12. Urbana (EC Iowa) Non-glyphosate-treated.


LATHAM L2684L 2.6 PI 88788 2.2 2,000 2.6 2.6 68.9 68.9Champion 26L16N 2.6 PI 88788 2.3 1,800 3.1 3.1 66.1 66.1NuTech 3309L 3.0 PI 88788 3.5 1,975 3.4 3.4 64.0 64.0NuTech 3252L 2.5 PI 88788 2.1 1,000 2.2 2.2 63.9 63.9Hoegemeyer HPT LL2599 2.5 PI 88788 2.3 725 1.3 1.3 61.1 61.1Hoegemeyer HPT LL2877 2.8 PI 88788 2.8 1,200 2.4 2.4 60.3 60.3NuTech 3236L 2.3 PI 88788 3.3 14,050 18.7 18.7 59.7 59.7LATHAM L3187L 3.1 PI 88788 3.3 950 1.7 1.7 58.1 58.1

Mean 2.7 - 2.7 2,963 4.4 62.8LSD3 (P = 0.10) - - - 2,817 - 4.3




Table 13. Glenwood (SW Iowa) Glyphosate-treated.


DAIRYLAND SEED DSR-3630/R2Y 3.6 PI 88788 3.3 13,950 29.4 29.4 82.7 82.7LG Seeds C3550RX 3.5 PI 88788 3.6 18,975 42.2 42.2 78.8 78.8Hoegemeyer HPT 3422 NR 3.4 PI 88788 2.3 12,725 21.2 21.2 76.2 76.2NK S33-T8X 3.3 PI 88788 2.6 16,275 15.1 15.1 76.2 76.2Pfister 32R201 3.2 PI 88788 3.4 9,050 12.9 12.9 76.0 76.0ASGROW AG36X6 3.6 PI 88788 3.3 20,075 61.8 61.8 75.9 75.9Kruger K2X-3552 3.5 PI 88788 3.5 11,750 29.4 29.4 75.2 75.2Prairie Brand PB-2917R2 2.9 PI 88788 3.1 19,475 64.9 64.9 75.1 75.1Federal Hybrids F3080N R2X 3.0 PI 88788 3.5 16,700 51.4 51.4 75.1 75.1FS HiSOY 34X60 3.4 PI 88788 3.0 12,300 44.7 44.7 75.1 75.1ASGROW AG33X8 3.3 PI 88788 3.0 13,150 37.6 37.6 74.7 74.7Pioneer P31T11R 3.1 PI 88788 2.6 7,450 21.3 21.3 74.6 74.6LG Seeds C3489RX 3.4 PI 88788 3.5 17,925 18.9 18.9 74.5 74.5LATHAM L3448R2X 3.4 PI 88788 3.3 12,075 37.2 37.2 73.8 73.8NuTech 7352X 3.5 PI 88788 3.2 8,150 16.3 16.3 73.8 73.8DAIRYLAND SEED DSR-3555/R2Y 3.5 PI 88788 3.1 19,000 16.2 16.2 73.7 73.7Kruger K2X-3852 3.8 PI 88788 3.1 16,550 41.4 41.4 73.7 73.7Dyna-Gro S34XT78 3.4 PI 88788 3.4 14,900 17.5 17.5 73.4 73.4Cornelius CB28R58 2.8 PI 88788 3.1 22,025 40.0 40.0 73.3 73.3Merschman Washington 1839GT 3.9 PI 88788 2.9 6,025 15.1 15.1 73.2 73.24 STAR 3X320 3.2 PI 88788 3.1 12,600 11.5 11.5 73.1 73.1Pioneer P38T20X 3.8 PI 88788 3.4 16,350 21.8 21.8 72.7 72.7Champion 34R87N 3.4 PI 88788 3.3 16,975 61.7 61.7 72.6 72.6Jacobsen 878NR2X 2.8 PI 88788 3.3 12,250 24.5 24.5 72.6 72.6FS HiSOY 37X70 3.7 PI 88788 2.9 14,575 25.3 25.3 72.5 72.5Dyna-Gro S33XT07 3.3 PI 88788 3.4 12,975 14.8 14.8 72.3 72.3NuTech 7317 3.1 PI 88788 2.8 10,900 24.2 24.2 71.9 71.9Stine 38RE02 3.8 PI 88788 3.3 21,850 28.2 28.2 71.7 71.7Merschman Kennedy 1835GT 3.5 PI 88788 3.3 9,200 40.9 40.9 71.7 71.7Pioneer P36T36X 3.8 PI 88788 3.3 23,325 31.1 31.1 71.3 71.3Hoegemeyer HPT 3149 NX 3.1 PI 88788 3.1 25,250 43.9 43.9 71.0 71.0Jacobsen 960NR2X 3.0 PI 88788 2.9 10,850 48.2 48.2 71.0 71.0Morsoy 3747 RXT 3.7 PI 88788 3.0 13,575 30.2 30.2 71.0 71.0FS HiSOY 35X70 3.5 PI 88788 2.9 15,775 22.5 22.5 70.6 70.6NK S35-K9X 3.5 PI 88788 2.8 38,475 57.0 57.0 70.2 70.2Pioneer P32T16R 3.2 PI 88788 3.1 14,450 7.5 7.5 70.2 70.2ASGROW AG29X8 2.9 PI 88788 3.1 19,875 132.5 132.5 70.1 70.1Morsoy 3357 RXT 3.3 PI 88788 3.4 16,450 23.5 23.5 70.0 70.0NK S29-K3X 2.9 PI 88788 2.3 10,975 20.9 20.9 69.9 69.9DAIRYLAND SEED DSR-3745/R2Y 3.7 PI 88788 3.3 13,025 13.0 13.0 69.9 69.9Pioneer P36A18X 3.6 PI 88788 3.3 20,600 21.1 21.1 69.3 69.3ASGROW AG32X6 3.2 PI 88788 3.2 17,975 11.8 11.8 69.2 69.2Mycogen 5N327R2 3.2 PI 88788 3.3 7,075 12.3 12.3 68.7 68.7NK S37-H5X 3.7 PI 88788 3.1 12,875 30.3 30.3 68.7 68.7Cornelius CB29R69 2.9 PI 88788 3.3 21,875 32.4 32.4 68.7 68.7Prairie Brand PB-3186R2 3.1 PI 88788 3.3 14,750 24.6 24.6 68.6 68.6Pfister 34R20 3.4 PI 88788 2.9 16,050 26.8 26.8 67.0 67.0LATHAM L3278R2X 3.2 PI 88788 3.3 11,000 23.2 23.2 66.4 66.4Mycogen 5N342R2 3.4 PI 88788 2.9 13,575 16.0 16.0 66.2 66.2Dyna-Gro S31XT48 3.1 PI 88788 3.5 12,950 43.2 43.2 64.4 64.4ASGROW AG30X8 3.0 PI 88788 2.8 16,300 13.3 13.3 62.3 62.3

Mean 3.3 - 3.1 15,358 30.8 72.0LSD3 (P = 0.10) - - - 13,156 - 5.5

Kruger K2-2301 2.3 None 3.4 23,300 31.1 31.1 71.3 71.3Dyna-Gro 39RY25 2.5 None 3.6 16,200 18.5 18.5 69.8 69.8ASGROW AG2431 2.4 None 2.4 14,725 36.8 36.8 66.9 66.9

Mean 2.4 - 3.1 18,075 28.8 69.3Values presented in tables are means. Entries are listed in decreasing order of yield.Italicized entries are widely available 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 634 eggs per 100 cc soil; HG type 1.2- (59% on PI 88788, 16% on Peking).2 Reproductive factor (RF) = average final SCN egg population density / average initial SCN egg population density; RF 1.0 = no change in SCN population density over growing season.3 Least significant difference: values are from Fisher's least-significant-difference test, NS = no significant differences among the varieties.


Table 14. Glenwood (SW Iowa) Non-glyphosate-treated.


Merschman Grant 1537LL 3.7 PI 88788 3.2 20,750 55.3 55.3 77.1 77.1Hoegemeyer HPT LL3201 N 3.2 PI 88788 3.3 9,750 15.0 15.0 75.5 75.5Merschman Monroe 1736LL 3.6 PI 88788 3.4 11,600 16.0 16.0 75.3 75.3LATHAM L3384L 3.3 PI 88788 3.0 12,700 46.2 46.2 74.9 74.9Merschman Truman 1438LL 3.8 PI 88788 3.3 14,000 25.5 25.5 74.4 74.4NuTech 3309L 3.0 PI 88788 4.1 18,425 23.0 23.0 74.3 74.3Hoegemeyer HPT LL3813 N 3.8 PI 88788 3.3 10,475 22.1 22.1 72.2 72.2LATHAM L3178L 3.1 PI 88788 3.3 16,200 20.9 20.9 71.5 71.5

Mean 3.4 - 3.4 14,238 28.0 74.4LSD3 (P = 0.10) - - - NS - NS




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


Pioneer P36A18X 3.6 PI 88788 3.3 8,300 11.9 11.9 57.0 57.0Jacobsen 878NR2X 2.8 PI 88788 3.3 9,450 17.2 17.2 55.9 55.9Stine 38RE02 3.8 PI 88788 3.3 5,025 8.4 8.4 55.0 55.0NuTech 7352X 3.5 PI 88788 3.2 5,025 5.7 5.7 54.9 54.9LATHAM L3448R2X 3.4 PI 88788 3.3 13,525 22.5 22.5 54.6 54.6NuTech 7317 3.1 PI 88788 2.8 6,575 13.2 13.2 54.6 54.6Morsoy 3747 RXT 3.7 PI 88788 3.0 11,200 16.6 16.6 54.4 54.4DAIRYLAND SEED DSR-3745/R2Y 3.7 PI 88788 3.3 7,750 19.4 19.4 54.1 54.1ASGROW AG33X8 3.3 PI 88788 3.0 8,400 10.5 10.5 54.1 54.1Hoegemeyer HPT 3422 NR 3.4 PI 88788 2.3 7,775 19.4 19.4 54.0 54.0NK S35-K9X 3.5 PI 88788 2.8 10,400 21.9 21.9 54.0 54.0LATHAM L3278R2X 3.2 PI 88788 3.3 10,025 13.8 13.8 53.7 53.7Pfister 32R201 3.2 PI 88788 3.4 8,675 9.1 9.1 53.4 53.4Hoegemeyer HPT 3149 NX 3.1 PI 88788 3.1 9,500 9.0 9.0 53.1 53.1ASGROW AG36X6 3.6 PI 88788 3.3 7,200 13.7 13.7 53.1 53.1ASGROW AG30X8 3.0 PI 88788 2.8 7,000 7.8 7.8 53.1 53.1LG Seeds C3550RX 3.5 PI 88788 3.6 4,825 12.9 12.9 52.6 52.6FS HiSOY 34X60 3.4 PI 88788 3.0 9,475 7.9 7.9 52.6 52.6Pioneer P31T11R 3.1 PI 88788 2.6 5,025 11.8 11.8 52.6 52.6DAIRYLAND SEED DSR-3630/R2Y 3.6 PI 88788 3.3 8,750 8.8 8.8 52.1 52.1Kruger K2X-3852 3.8 PI 88788 3.1 7,925 15.1 15.1 52.0 52.0Merschman Washington 1839GT 3.9 PI 88788 2.9 6,600 9.1 9.1 51.8 51.8FS HiSOY 37X70 3.7 PI 88788 2.9 7,950 10.6 10.6 51.8 51.8Pioneer P32T16R 3.2 PI 88788 3.1 6,450 9.9 9.9 51.8 51.8Champion 34R87N 3.4 PI 88788 3.3 6,375 7.5 7.5 51.6 51.6Pioneer P38T20X 3.8 PI 88788 3.4 7,800 10.4 10.4 51.6 51.6Kruger K2X-3552 3.5 PI 88788 3.5 7,700 6.8 6.8 51.6 51.6DAIRYLAND SEED DSR-3555/R2Y 3.5 PI 88788 3.1 6,375 9.4 9.4 51.4 51.4Federal Hybrids F3080N R2X 3.0 PI 88788 3.5 7,150 7.5 7.5 51.2 51.2Prairie Brand PB-3186R2 3.1 PI 88788 3.3 7,625 8.7 8.7 51.1 51.1Pioneer P36T36X 3.8 PI 88788 3.3 12,425 12.1 12.1 50.7 50.7Morsoy 3357 RXT 3.3 PI 88788 3.4 7,975 18.8 18.8 50.6 50.6Pfister 34R20 3.4 PI 88788 2.9 9,550 12.7 12.7 50.3 50.3Dyna-Gro S31XT48 3.1 PI 88788 3.5 9,700 10.5 10.5 50.0 50.0NK S29-K3X 2.9 PI 88788 2.3 7,725 12.9 12.9 50.0 50.0NK S33-T8X 3.3 PI 88788 2.6 9,275 11.6 11.6 49.9 49.9NK S37-H5X 3.7 PI 88788 3.1 12,700 14.1 14.1 49.7 49.7Dyna-Gro S33XT07 3.3 PI 88788 3.4 10,200 14.1 14.1 49.4 49.4Dyna-Gro S34XT78 3.4 PI 88788 3.4 6,150 8.8 8.8 49.4 49.4ASGROW AG32X6 3.2 PI 88788 3.2 6,725 14.2 14.2 49.4 49.4Merschman Kennedy 1835GT 3.5 PI 88788 3.3 7,025 13.4 13.4 49.2 49.2LG Seeds C3489RX 3.4 PI 88788 3.5 8,850 6.9 6.9 49.2 49.24 STAR 3X320 3.2 PI 88788 3.1 10,875 18.1 18.1 49.2 49.2Mycogen 5N342R2 3.4 PI 88788 2.9 9,575 15.3 15.3 48.8 48.8Cornelius CB28R58 2.8 PI 88788 3.1 4,975 5.5 5.5 48.3 48.3Jacobsen 960NR2X 3.0 PI 88788 2.9 4,925 10.4 10.4 48.0 48.0ASGROW AG29X8 2.9 PI 88788 3.1 11,650 10.8 10.8 47.7 47.7Mycogen 5N327R2 3.2 PI 88788 3.3 5,025 6.5 6.5 47.6 47.6Prairie Brand PB-2917R2 2.9 PI 88788 3.1 5,200 3.5 3.5 46.6 46.6FS HiSOY 35X70 3.5 PI 88788 2.9 6,750 9.0 9.0 45.0 45.0Cornelius CB29R69 2.9 PI 88788 3.3 11,325 12.2 12.2 44.4 44.4

Mean 3.3 - 3.1 8,126 11.7 51.3LSD3 (P = 0.10) - - - NS - 4.3




Table 16. Leighton (SC Iowa) Non-glyphosate-treated.


Merschman Monroe 1736LL 3.6 PI 88788 3.4 4,400 7.0 7.0 48.9 48.9Hoegemeyer HPT LL3201 N 3.2 PI 88788 3.3 4,850 4.0 4.0 46.8 46.8Hoegemeyer HPT LL3813 N 3.8 PI 88788 3.3 7,775 8.9 8.9 45.9 45.9Merschman Grant 1537LL 3.7 PI 88788 3.2 5,100 4.3 4.3 45.9 45.9Merschman Truman 1438LL 3.8 PI 88788 3.3 5,675 5.4 5.4 45.8 45.8NuTech 3309L 3.0 PI 88788 4.1 5,725 8.2 8.2 44.8 44.8LATHAM L3178L 3.1 PI 88788 3.3 5,500 3.9 3.9 44.3 44.3LATHAM L3384L 3.3 PI 88788 3.0 10,200 11.3 11.3 42.1 42.1

Mean 3.4 - 3.4 6,153 6.6 45.6LSD3 (P = 0.10) - - - 4,800 - 5.4




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


Pioneer P31T11R 3.1 PI 88788 2.6 16,850 13.5 13.5 76.8 76.8Mycogen 5N327R2 3.2 PI 88788 3.3 8,350 10.1 10.1 74.6 74.6Kruger K2X-3852 3.8 PI 88788 3.1 7,500 10.3 10.3 73.6 73.6NK S33-T8X 3.3 PI 88788 2.6 9,550 7.5 7.5 72.8 72.8Pioneer P32T16R 3.2 PI 88788 3.1 10,850 10.3 10.3 72.5 72.5Jacobsen 878NR2X 2.8 PI 88788 3.3 11,700 11.4 11.4 72.0 72.0NuTech 7317 3.1 PI 88788 2.8 13,150 13.8 13.8 71.5 71.5FS HiSOY 34X60 3.4 PI 88788 3.0 9,975 10.5 10.5 71.0 71.0Jacobsen 960NR2X 3.0 PI 88788 2.9 8,925 4.9 4.9 70.9 70.9Hoegemeyer HPT 3422 NR 3.4 PI 88788 2.3 14,250 21.1 21.1 69.9 69.9Dyna-Gro S34XT78 3.4 PI 88788 3.4 11,150 9.3 9.3 69.1 69.1DAIRYLAND SEED DSR-3555/R2Y 3.5 PI 88788 3.1 7,075 7.6 7.6 69.0 69.0Merschman Kennedy 1835GT 3.5 PI 88788 3.3 15,800 14.4 14.4 68.8 68.8LG Seeds C3550RX 3.5 PI 88788 3.6 16,350 23.4 23.4 68.8 68.8NuTech 7352X 3.5 PI 88788 3.2 8,325 12.8 12.8 68.8 68.8FS HiSOY 35X70 3.5 PI 88788 2.9 9,300 13.8 13.8 68.7 68.7Pfister 32R201 3.2 PI 88788 3.4 11,850 33.9 33.9 68.6 68.6ASGROW AG36X6 3.6 PI 88788 3.3 15,075 28.7 28.7 68.5 68.5ASGROW AG32X6 3.2 PI 88788 3.2 9,775 10.3 10.3 68.4 68.4Cornelius CB28R58 2.8 PI 88788 3.1 12,050 10.3 10.3 68.4 68.4LG Seeds C3489RX 3.4 PI 88788 3.5 9,375 15.6 15.6 68.3 68.3Morsoy 3357 RXT 3.3 PI 88788 3.4 14,475 19.3 19.3 67.8 67.8LATHAM L3278R2X 3.2 PI 88788 3.3 16,975 20.0 20.0 67.5 67.5ASGROW AG33X8 3.3 PI 88788 3.0 7,425 8.7 8.7 67.2 67.2Pioneer P36A18X 3.6 PI 88788 3.3 13,550 14.3 14.3 67.2 67.2Kruger K2X-3552 3.5 PI 88788 3.5 6,650 8.9 8.9 67.1 67.1LATHAM L3448R2X 3.4 PI 88788 3.3 18,350 8.7 8.7 66.9 66.9DAIRYLAND SEED DSR-3630/R2Y 3.6 PI 88788 3.3 14,400 13.1 13.1 66.9 66.9Merschman Washington 1839GT 3.9 PI 88788 2.9 11,675 15.6 15.6 66.6 66.6Dyna-Gro S31XT48 3.1 PI 88788 3.5 12,775 10.4 10.4 66.6 66.6NK S29-K3X 2.9 PI 88788 2.3 7,325 10.5 10.5 66.6 66.6NK S37-H5X 3.7 PI 88788 3.1 12,475 17.8 17.8 66.3 66.3Pioneer P38T20X 3.8 PI 88788 3.4 6,975 6.6 6.6 66.0 66.0Prairie Brand PB-3186R2 3.1 PI 88788 3.3 11,325 8.1 8.1 65.9 65.9ASGROW AG30X8 3.0 PI 88788 2.8 12,025 9.4 9.4 65.9 65.9Prairie Brand PB-2917R2 2.9 PI 88788 3.1 9,700 7.9 7.9 65.4 65.4Stine 38RE02 3.8 PI 88788 3.3 15,625 15.2 15.2 65.3 65.3Champion 34R87N 3.4 PI 88788 3.3 10,450 10.0 10.0 64.8 64.8Pioneer P36T36X 3.8 PI 88788 3.3 15,525 11.3 11.3 64.4 64.4NK S35-K9X 3.5 PI 88788 2.8 20,375 21.4 21.4 64.1 64.1Mycogen 5N342R2 3.4 PI 88788 2.9 21,700 36.2 36.2 63.8 63.8ASGROW AG29X8 2.9 PI 88788 3.1 12,000 16.0 16.0 63.7 63.7Morsoy 3747 RXT 3.7 PI 88788 3.0 17,075 14.8 14.8 63.5 63.5DAIRYLAND SEED DSR-3745/R2Y 3.7 PI 88788 3.3 17,200 18.6 18.6 63.4 63.4Pfister 34R20 3.4 PI 88788 2.9 16,625 19.0 19.0 62.4 62.4FS HiSOY 37X70 3.7 PI 88788 2.9 17,875 23.8 23.8 62.1 62.14 STAR 3X320 3.2 PI 88788 3.1 14,800 20.4 20.4 61.8 61.8Cornelius CB29R69 2.9 PI 88788 3.3 15,725 15.7 15.7 61.3 61.3Dyna-Gro S33XT07 3.3 PI 88788 3.4 13,875 9.9 9.9 60.4 60.4Federal Hybrids F3080N R2X 3.0 PI 88788 3.5 11,775 13.1 13.1 60.3 60.3Hoegemeyer HPT 3149 NX 3.1 PI 88788 3.1 15,450 12.4 12.4 59.5 59.5

Mean 3.3 - 3.1 12,733 14.3 67.1LSD3 (P = 0.10) - - - 8,546 - 4.5




Table 18. Fruitland (SE Iowa) Non-glyphosate-treated.


NuTech 3309L 3.0 PI 88788 4.1 6,475 7.8 7.8 69.8 69.8Hoegemeyer HPT LL3201 N 3.2 PI 88788 3.3 9,775 11.8 11.8 67.6 67.6LATHAM L3178L 3.1 PI 88788 3.3 8,150 6.5 6.5 62.8 62.8Merschman Grant 1537LL 3.7 PI 88788 3.2 15,050 12.3 12.3 61.3 61.3Hoegemeyer HPT LL3813 N 3.8 PI 88788 3.3 17,325 19.3 19.3 59.2 59.2Merschman Monroe 1736LL 3.6 PI 88788 3.4 19,075 20.6 20.6 58.0 58.0Merschman Truman 1438LL 3.8 PI 88788 3.3 15,750 17.0 17.0 54.2 54.2LATHAM L3384L 3.3 PI 88788 3.0 26,725 25.5 25.5 49.7 49.7

Mean 3.4 - 3.4 14,791 15.1 60.3LSD3 (P = 0.10) - - - 8,583 - 4.5

Kruger K2-2301 2.3 None 2.3 20,750 19.3 19.3 44.5 44.5Dyna-Gro 39RY25 2.5 None 2.5 12,700 13.4 13.4 42.2 42.2NK S24-K2 2.4 None 2.4 14,625 11.5 11.5 41.7 41.7



Table 19. Seed treatments used on varieties evaluated in 2017.

Brand Seed Treatment Brand Seed Treatment Brand Seed Treatment

4 Star Acceleron® Jacobsen Acceleron® FI Mycogen CruiserMaxx®

ASGROW Acceleron® FI Hoegemeyer HPT Right Stand® NK CruiserMaxx®

Champion* Acceleron® Kruger Acceleron® FI NuTech SmartCote® Extra

Cornelius CruiserMaxx® Vibrance® LATHAM* SoyShield Plus™ Pfister CruiserMaxx®

Dairyland Seed CruiserMaxx® Optimize® Legacy Seeds L-Coat Total Pioneer PPST 2030

Dyna-Gro Equity® VIP LG Seeds CruiserMaxx® Prairie Brand CruiserMaxx®

Federal Hybrids* Maximum ArmourGuard™ Merschman Bonus Coated +™ Stine CruiserMaxx®

FS HiSOY Acceleron® FI MorSoy CruiserMaxx®Vibrance® Wensman* CruiserMaxx®

*Some varieties were sent untreated. Seeds of those varieties, listed below, were treated with CruiserMaxx® by Iowa State University personnel. • Federal: F2080N R2X, F2880N R2X, F2280N R2X, F3080N R2X • Champion: 20X98N

• LATHAM: L3448R2X, L2682R2X, L3278R2X, L2368R2X, L3187L • Wensman: W1220NRX

Table 20. Contact information for companies represented in 2017 variety trials. Champion Seed - Rob Thomas phone: 888-417-2004 e-mail: [email protected] website: www.championseedofiowa.com Cornelius Seed - Will Cornelius phone: 563-672-3463 e-mail: [email protected] website: www.corneliusseed.com Crop Production Services (Dyna-Gro)- Valerie Oberbroeckling phone: 563-543-7979 email: [email protected] website: www.dynagroseed.com Dairyland Seed phone: 800-236-0163 e-mail: [email protected] website: www.dairylandseed.com Federal Hybrids - Dan Swalla phone: 712-830-9742 e-mail: [email protected] website: www.federalhybrids.com Four Star Seed Company - Dennis Kenealy phone: 712-644-1400 e-mail: [email protected] website: www.4starseed.com GROWMARK, Inc. (FS HiSOY) - Eric West phone: 309-557-6399 e-mail: [email protected] website: www.fsseeds.com Hoegemeyer Hybrids - Ryan Spurgeon phone: 402-654-3399 e-mail: [email protected] website: www.therightseed.com

Jacobsen Seed – Nora Schultz phone: 800-761-1024 e-mail: [email protected] website: www.jacobsenseed.com Kruger Seed - Neal Borgmeyer phone: 515-238-4572 e-mail: [email protected] website: www.krugerseed.com Latham Hi-Tech Seeds -Mark Grundmeier phone: 877-465-2842 e-mail: [email protected] website: www.lathamseeds.com Legacy Seeds, Inc. - Jim Wold phone: 715-467-2556 e-mail: [email protected] website: www.legacyseeds.com LG Seeds - Greg Peters phone: 515-370-3377 e-mail: [email protected] website: www.lgseeds.com Merschman Seeds - Brian McKillip phone: 319-837-6111 e-mail: [email protected] website: www.merschmanseeds.com MFA Incorporated (MorSoy) - Brian Anderson phone: 573-999-1003 e-mail: [email protected] website: www.morsoy.com Monsanto (ASGROW) - George Kadrmas phone: 319-350-0744 e-mail: [email protected] website: www.asgrowanddekalb.com

Mycogen Seeds - Josh Enderson phone: 515-851-5144 e-mail: [email protected] website: www.mycogen.com NuTech Seed, LLC - Steve Sick phone: 402-661-4700 e-mail: [email protected] website: www.yieldleader.com Pfister Seeds - Brad Johnson phone: 515-681-9092 e-mail: [email protected] website: www.pfisterseeds.com Pioneer Hi-Bred Int. Inc. - Troy Bauer phone: 515-418-0078 e-mail: [email protected] website: www.pioneer.com Prairie Brand Seeds - Mike Carr phone: 800-544-8751 e-mail: [email protected] website: www.prairiebrandseed.com Stine Seed Company - Brian Hartman phone: 314-707-6826 e-mail: [email protected] website: www.stineseed.com Syngenta Seeds (NK) - Austin Hively phone: 712-344-2527 e-mail: [email protected] website: www.nksoybeans.com Wensman Seed Company - Kyle Kepner phone: 320-760-4369 e-mail: [email protected] website: www.wensmanseed.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.

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