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首页> 外文期刊>Weed technology: A journal of the Weed Science Society of America >Cotton response to simulated drift of seven hormonal-type herbicides.
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Cotton response to simulated drift of seven hormonal-type herbicides.

机译：Cotton response to simulated drift of seven hormonal-type herbicides.

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Field experiments were conducted at Manhattan and Hesston (Kansas, USA) in 2004, and at Manhattan in 2005, to evaluate the cotton response to seven hormonal-type herbicides. Herbicides 2,4-D amine, 2,4-D ester, clopyralid, picloram, fluroxypyr, triclopyr, and dicamba were each applied at 0, 1/100, 1/200, 1/300, and 1/400 of the herbicide use rates on cotton in the six- to eight-leaf stage. The herbicide use rates were 210 and 280 g a.e./ha for fluroxypyr and clopyralid and 561 g a.e./ha, for 2,4-D amine, 2,4-D ester, dicamba, picloram, and triclopyr. At 14 d after treatment (DAT), all the herbicides caused leaf cupping and epinasty, except for triclopyr and clopyralid, which caused severe bleaching and chlorosis. The order of visual injury ratings was 2,4-D ester > 2,4-D amine > picloram > dicamba > fluroxypyr > triclopyr > clopyralid. By 56 DAT, slight injury symptoms were observed on plants treated with all the herbicides, except for all rates of 2,4-D, from which symptoms were severe. All the rates of 2,4-D and the highest rate of picloram caused more than 60 flower abortion. Ranking of fibre yield reduction after herbicide treatment was 2,4-D ester > 2,4-D amine > picloram > fluroxypyr > dicamba > clopyralid > triclopyr. This research demonstrated that cotton is extremely susceptible to simulated drift rates of 2,4-D and picloram, whereas clopyralid and triclopyr caused early injury, with minimal effect on cotton yield.

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