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Influence of AE F130060 03 Application Timing on Italian Ryegrass (Lolium multiflorum) Control

Published online by Cambridge University Press:  20 January 2017

William A. Bailey ,
Henry P. Wilson  and
Thomas E. Hines
William A. Bailey
Affiliation:
Virginia Tech, Eastern Shore Agricultural Research and Extension Center, 33446 Research Drive, Painter, VA 23420
Henry P. Wilson*
Affiliation:
Virginia Tech, Eastern Shore Agricultural Research and Extension Center, 33446 Research Drive, Painter, VA 23420
Thomas E. Hines
Affiliation:
Virginia Tech, Eastern Shore Agricultural Research and Extension Center, 33446 Research Drive, Painter, VA 23420
*
Corresponding author's E-mail: hwilson@vt.edu
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Abstract

Experiments were conducted in Virginia in 2000 and 2001 to investigate responses of winter wheat and diclofop-sensitive and -resistant Italian ryegrass to the experimental herbicide mixture AE F130060 03 and crop safener AE F107892 applied postemergence. AE F130060 03 at 15 or 18 g ai/ha with or without methylated seed oil controlled both diclofop-sensitive and -resistant Italian ryegrass 82 to 99% and reduced inflorescence emergence 59 to 98%. Although AE F130060 03 controlled existing Italian ryegrass 4 wk after any application, timing of application influenced late-season Italian ryegrass control and inflorescence emergence. Applications to two- to three-leaf Italian ryegrass resulted in greater emergence of Italian ryegrass after application than applications made to two- to three-tiller or four- to five-tiller Italian ryegrass. Wheat injury by AE F130060 03 was greater than injury from diclofop, but wheat appeared to fully recover; and yields from AE F130060 03–treated wheat were similar to yields of diclofop-treated wheat and at least 21% greater than yields from nontreated wheat. In greenhouse experiments, differential growth responses between diclofop-sensitive and -resistant Italian ryegrass occurred after AE F130060 03 application at normal (15 g ai/ha) and below-normal application rates. When rates were increased beyond normal application rates, growth responses were similar between diclofop-sensitive and -resistant Italian ryegrass.

Keywords

AE F130060 03 (8.3:1.7 mixture of AE F130060 00, proposed common name mesosulfuron-methyl, 2-[(4,6-dimethoxypyrimidin-2-yl carbamoyl)sulfamoyl]-4-methanesulfonamido-p-toluic acid, plus AE F115008 00, proposed common name iodosulfuron-methyl-sodium, 4-iodo-2-[3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)ureidosulfonyl]benzoic acid)AE F107892, proposed common name mefenpyr-diethyl, 1-(2,4-dichlorophenyl)-4,5-dihydro-5-methyl-1H-pyrazole-3,5-dicarboxylic aciddiclofopItalian ryegrass, Lolium multiflorum Lam. LOLMU #3winter wheat, Triticum aestivum. L. ‘Pioneer 2643’, ‘Pioneer 26R24’, ‘Pocohontas’Diclofop resistanceresistance managementACCase, acetyl coenzyme A carboxylaseALS, acetolactate synthaseMSO, methylated seed oilPOST, postemergence
Type
Research
Information
Weed Technology , Volume 17 , Issue 4 , December 2003 , pp. 842 - 853
Copyright
Copyright © Weed Science Society of America 

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