Determination of Antagonism between Cyhalofop-butyl and Other Rice (Oryza sativa) Herbicides in Barnyardgrass (Echinochloa crus-galli)

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• 作者：Brian V. Ottis ; John D. Mattice ; and Ronald E. Talbert
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2005
• 出版时间：May 18, 2005
• 年：2005
• 卷：53
• 期：10
• 页码：4064 - 4068
• 全文大小：76K
• 年卷期：v.53,no.10(May 18, 2005)
• ISSN：1520-5118

文摘

Herbicide antagonism is defined as the reduction of control of certain weeds as the result of applyingmixtures of two or more herbicides. Cyhalofop-butyl, a graminicide used for postemergence grassweed control in rice, is antagonized by some rice herbicides when applied simultaneously. The resultof this type of antagonism usually results in decreased control of grass weeds. Research has shownthat herbicide antagonism between graminicides and other herbicides may be caused by differentmechanisms as the result of activity of the tank-mix partner. Using HPLC, the objective of thisexperiment was to analyze the fate of cyhalofop-butyl in barnyardgrass tissue when applied aloneand in combination with halosulfuron, propanil, or triclopyr. Results indicated that absorption ofcyhalofop-butyl and hydrolysis to its phytotoxic metabolite, cyhalofop-acid, was rapid and thathalosulfuron and triclopyr had no effect. Because of a likely interaction of propanil with an apoplasticesterase enzyme, increased levels of cyhalofop-butyl and cyhalofop-acid were detected in barnyardgrass tissue, indicating that cyhalofop-butyl metabolism was hindered by propanil.Keywords: Barnyardgrass [Echinochloa crus-galli (L.) Beauv.]; cyhalofop-acid; cyhalofop-butyl;herbicide antagonism