Antagonism of ACCase Herbicides Hypothesis and Objectives
Transcript of Antagonism of ACCase Herbicides Hypothesis and Objectives
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Antagonism of ACCase Inhibitor Herbicides Used in Xtend Soybean
Systems for Control ofVolunteer Corn
Marcelo Zimmer, Bryan G. Young,
and William G. Johnson
• Weed that grows from corn grain left in the fields after harvest
• Impact: Soybean yield losses, corn rootworm host, and harvest issues 1, 6
• Herbicide options vary according to corn herbicide-tolerance traits planted
• High efficacy of aryloxyphenoxypropionate (FOPs) and cyclohexanedione (DIMs) graminicide families reported on volunteer glyphosate-resistant corn 1, 5, 7, 9
Volunteer Corn
Volunteer corn sprouting from corn ears.Photo: Amit Jhala
Volunteer corn clumps.Photo: Jenny Rees
Antagonism of ACCase Herbicides
• Synthetic auxin herbicides and glyphosate
are known to antagonize ACCase inhibitor
herbicides on volunteer corn 3, 4, 8, 10, 11, 12
• Widespread adoption of Xtend soybeans
for management of herbicide-resistant
weeds
• Industry research reports show reduced
volunteer corn control with clethodim
when tank-mixed with dicamba and/or
acetochlor 2
Necrosis of growing point at whorl following application of ACCase inhibitor herbicides
Plants stop growing within hours of application and newer leaves die first
• Hypothesis: The addition of dicamba plus glyphosate and/or acetochlor will reduce the efficacy of clethodim and quizalofop on volunteer corn. The antagonistic effect of dicamba plus glyphosate and acetochlor these herbicides can be overcome by increasing ACCase field use rates by 50%.
• Objectives:
Investigate the effect of dicamba and acetochlor on the efficacy of two ACCase herbicides (clethodim and quizalofop) used for volunteer corn control
Evaluate the effect of ACCase inhibitor field rates used in tank-mixtures with dicamba and/or acetochlor
Hypothesis and Objectives
• Field experiment conducted during 2020
RCBD with 4 replications
• Three corn hybrids planted at 90,000 seeds ha-1 across Xtend (Asgrow AG29X9) soybean plots (3 x 9 m):
Non-GMO
Federal Hybrids RK112
SmartStax®
Dekalb DKC62-52RIB
Enlist® + SmartStax®
Mycogen MY10Z29
Materials and Methods
Non-GMO RR2/LL Enlist
• Field experiment conducted during 2020
RCBD with 4 replications
• Three corn hybrids (F1) planted at 90,000 seeds ha-1
across Xtend (Asgrow AG29X9) soybean plots (3 x 9 m):
Non-GMO
Federal Hybrids RK112
SmartStax®
Dekalb DKC62-52RIB
Enlist® + SmartStax®
Mycogen MY10Z29
Materials and Methods
Non-GMO RR2/LL Enlist
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• Factorial arrangement of herbicide treatments plus nontreated control: Factor 1 – ACCase herbicide: quizalofop or
clethodim
Factor 2 – ACCase rate: clethodim @ 70 or 105 g ai ha-1 (low and high rate)
quizalofop @ 31 or 46.3 g ai ha-1 (low and high rate)
Factor 3 – Addition of dicamba (560 g ae ha-1) plus glyphosate (1260 g ae ha-1)
Factor 4 – Addition of acetochlor (1260 g ai ha-1)
Herbicide Treatments Herbicide Treatments
• Ammonium sulfate (AMS) and crop oil concentrate (COC) added to all treatments without dicamba + glyphosate
• Drift reducing agent (DRA) and non-ionic surfactant (NIS) added to all treatments with dicamba + glyphosate
• All treatments sprayed with Teejet TTI110015 nozzles at 140 L ha-1
• Volunteer corn height at application: 20 to 48 cm (V5 to V6)
• Visual control (0 to 100% scale) at 7, 14, and 21 days after treatment (DAT)
• Corn density (plants m-2) and number of corn ears (corn ears m-2) at soybean harvest
• Factorial Analysis of Variance using PROC GLIMMIX in SAS 9.4 and mean separation with Tukey’s HSD test
Data Collection and Analysis Results and Discussion
Factorial ANOVA – RR2/LL Control 21 DAT
Type III Tests of Fixed EffectsEffects Pr > FACCase herbicide (ACC-H) <0.001
ACCase rate (ACC-R) <0.001
ACC-H * ACC-R <0.001
Dicamba + glyphosate (DicGly) <0.001
ACC-H * DicGly <0.001
ACC-R * DicGly <0.001
ACC-H* ACC-R * DicGly 0.001
Acetochlor (Aceto) 0.007
ACC-H * Aceto <0.001
ACC-R * Aceto 0.195
ACC-H * ACC-R * Aceto <0.001
DicGly * Aceto 0.003
ACC-H * DicGly * Aceto <0.001
ACC-R * DicGly * Aceto 0.158
ACC-H * ACC-R * DicGly * Aceto 0.003
• Four-way interaction with p-value = 0.003
RR2/LL Control @ 21 DAT - Clethodim
b aa aa bc a
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RR2/LL Control @ 21 DAT - Clethodim
clet (low) + dic + gly
clet (high) + dic + gly
clet (low) + dic + gly + acet
clet (high) + dic + gly + acet
RR2/LL Control @ 21 DAT - Quizalofop
c abab aab abc b
RR2/LL Control @ 21 DAT - Quizalofop
quiz (low) + dic + gly
quiz (high) + dic + gly
quiz (low) + dic + gly + acet
quiz (high) + dic + gly + acet
RR2/LL Density @ Harvest
ab
de
e
ab
a
de
bc
de
cd
Conclusions
• The addition of dicamba plus glyphosate to POST applications of clethodim or quizalofop reduces control of volunteer corn in Xtend soybean systems
• Acetochlor reduces clethodim efficacy when tank-mixed with dicamba plus glyphosate
• The addition of acetochlor does not appear to reduce volunteer corn control with quizalofop
• Increasing the rate of ACCase herbicides by 50% resulted in increased efficacy, although many treatments resulted in standing plants at soybean harvest
• ACCase rates higher than the rates tested in this experiment are necessary to overcome herbicide antagonism when tank-mixing ACCases with dicamba plus glyphosate, especially if acetochloris added (clethodim only)
• Split POST applications and improved adjuvant use could be other alternatives for overcoming the antagonism of ACCase-inhibiting herbicides with dicamba
Implications
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• Investigate the physiologic basis for the antagonistic response of clethodim to the addition of acetochlor plus dicamba
• Assess the efficacy of ACCase inhibitor herbicides tank-mixed with dicamba and other group #15 residual herbicides (s-metolachlor and pyroxasulfone)
• Evaluate the effect of broadleaf herbicides labeled for use on Enlist E3 soybean systems (2,4-D, glyphosate, glufosinate) in tank-mixtures with ACCase-inhibiting herbicides on volunteer corn control
Future Research Acknowledgements
• Purdue weed science lab
References
1. Alms J, Moechnig M, Vos D, Clay SA (2016) Yield loss and management of volunteer corn in soybean. Weed Technol 30:254–262
2. Anonymous (2019) Investigating potential antagonism of Select Max® herbicide when mixed with Warrant® herbicide and dicamba. Bayer 2018 Research Report. https://www.corn-states.com/app/uploads/2019/02/Investigating-Potential-Antagonism-of-Select-Max%C2%AE-Herbicide-When-Mixed-with-Warrant%C2%AE-Herbicide-and-Dicamba_Bayer.pdf Accessed: November 13, 2020
3. Barnwell P, Cobb AH (1993) An investigation of aryloxyphenoxypropionate antagonism of auxin-type herbicide action on proton-efflux. Pestic Biochem Phys 47:87–97
4. Barnwell P, Cobb AH (1994) Graminicide antagonism by broadleaf weed herbicides. Pestic Sci 44:77–85
5. Chahal PS, Jhala AJ (2015a) Herbicide programs for control of glyphosate-resistant volunteer corn in glufosinate-resistant soybean. Weed Technol 29:431–443
6. Chahal PS, Jhala AJ (2015b) Impact of glyphosate-resistant volunteer corn (Zea mays L.) density, control timing, and late-season emergence on yield of glyphosate-resistant soybean (Glycine max L.). Crop Prot 81:38–42
7. Deen, W, Hamill A, Shropshire C, Soltani N, Sikkema PH (2006) Control of volunteer glyphosate-resistant corn (Zea mays) in glyphosate-resistant soybean (Glycine max). Weed Technol 20:261–266
8. Harre NT, Young JM, Young BG (2020) Influence of 2,4-D, dicamba, and glyphosate on clethodim efficacy of volunteer glyphosate-resistant corn. Weed Technol. 34:394–401. doi: 10.1017/wet.2019.124
9. Kniss AR, Sbatella GM, Wilson RG (2012) Volunteer glyphosate-resistant corn interference and control in glyphosate-resistant sugarbeet. Weed Technol 26:348–355
10. Mueller TC, Witt WW, Barrett M (1989) Antagonism of johnsongrass (Sorghum halepense) control with fenoxaprop, haloxyfop, and sethoxydim by 2,4-D. Weed Technol 3:86–89
11. Underwood MG, Soltani N, Hooker DC, Robinson DE (2016) The addition of dicamba to POST applications of quizalofop-p-ethyl or clethodim antagonizes volunteer glyphosate-resistant corn control in dicamba-resistant soybean. Weed Technol 30:639–647
12. Young BG, Hart SE, Wax LM (1996) Interactions of sethoxydim and corn (Zea mays) postemergence broadleaf herbicides on three annual grasses. Weed Technol 10:914–922
Questions?
Photo: Travis Legleiter
Marcelo [email protected] Office: (765) 496-2121
@MarceloZimmer3
Dr. Bill [email protected]
Office:(765) 494-4656@BillJohnson53