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Response of Sethoxydim-Resistant Corn (Zea mays) Hybrids to Postemergence Graminicides

Published online by Cambridge University Press:  12 June 2017

Mark J. Vangessel ,
Quintin Johnson  and
Mark Isaacs
Mark J. Vangessel
Affiliation:
Department of Plant and Soil Science, University of Delaware, Georgetown, DE 19947
Quintin Johnson
Affiliation:
Department of Plant and Soil Science, University of Delaware, Georgetown, DE 19947
Mark Isaacs
Affiliation:
Research and Education Center, University of Delaware, Georgetown, DE 19947
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Abstract

This research was designed to determine if sethoxydim-resistant corn hybrids exhibited levels of cross-resistance to other acetyl-coenzyme A carboxylase (ACCase)-inhibiting herbicides. Three sethoxydim-resistant hybrids were tested in 1995 and four in 1996. The hybrids were treated with the 1 × (labeled use rate for annual grass control) and 4 × rate of clethodim, fenoxaprop-P plus fluazifop-P, fluazifop-P, quizalofop-P, and sethoxydim. At the 1 × rate, similar levels of corn safety were observed in both years with sethoxydim, quizalofop-P (except Asgrow RX620SR in 1995), and in 1996, fenoxaprop-P plus fluazifop-P. Corn treated with the 4 × rate of sethoxydim did not exhibit injury, while all other ACCase-inhibiting herbicides cause > 50% corn injury. Sethoxydim-resistant com hybrids used in this study did not consistently exhibit acceptable levels of cross-resistance to other ACCase-inhibiting herbicides. The use of clethodim will control volunteer sethoxydim-resistant corn in rotational crops.

Keywords

Clethodim, (E,E)-(±)-2-[1-[[(3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefenoxaprop, (±)-2-[4-[(6-chloro-2-benzoaxazolyl)oxy]phenoxy]propanoic acidfluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyrimidinyl]oxy] phenoxy]propanoic acidnicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino] carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamidequizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethyl thio)propyl]-3-hydroxy-2-cyclohexen-1-onecorn, Zea mays L., ‘Asgrow RX620SR,’ ‘Cargill 7800SR,’ ‘DeKalb 404SR,’ ‘DeKalb 592SR,’ ‘Pioneer 3394’Cross-resistancecross-toleranceherbicide-resistant cropsACCase, acetyl-coenzyme A carboxylasePOST, postemergence
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 598 - 601
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

Literature Cited

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