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Palmer amaranth control, fecundity, and seed viability from soybean herbicides applied at first female inflorescence
Weed Technology ( IF 1.4 ) Pub Date : 2020-11-04 , DOI: 10.1017/wet.2020.119
Eric B. Scruggs , Mark J. VanGessel , David L. Holshouser , Michael L. Flessner

Palmer amaranth is an extremely troublesome weed for soybean growers because of its aggressive growth, adaptability, prolific seed production, and widespread resistance to many herbicides. Studies were initiated to determine the effects of herbicide application at first female inflorescence on Palmer amaranth control, biomass, seed production, cumulative germination, and seed viability. Enlist (2,4-D–resistant) soybean and Xtend (dicamba-resistant) soybean were planted and various combinations of either 2,4-D or dicamba with and without glufosinate and/or glyphosate were applied at first visible female Palmer amaranth inflorescence. Mixtures of 2,4-D + glufosinate and 2,4-D + glufosinate + glyphosate provided the greatest control at 4 wk after treatment in Enlist soybean. Similarly, in Xtend soybean, combinations of dicamba + glufosinate and dicamba + glufosinate + glyphosate provided the greatest control. The greatest reductions in biomass were from combinations of auxin herbicides (2,4-D or dicamba) plus glufosinate with and without glyphosate. Seed production was reduced most by treatments containing at least one effective site of action: an auxin herbicide (2,4-D or dicamba) or glufosinate. In contrast to previous research, cumulative germination and seed viability were not affected by herbicide treatments. This research indicates the efficacy of auxin herbicides or glufosinate alone and in combination to reduce the seed production of Palmer amaranth when applied at first female inflorescence. More research is needed to evaluate the full potential for applications of these herbicides at flower initiation to mitigate the evolution of herbicide resistance.

中文翻译:

在第一个雌花序处施用大豆除草剂对棕榈苋菜的控制、繁殖力和种子活力

苋菜对大豆种植者来说是一种非常麻烦的杂草,因为它生长旺盛、适应性强、种子产量高,并且对许多除草剂具有广泛的抗性。开始研究以确定在第一个雌花序施用除草剂对棕榈苋菜控制、生物量、种子产量、累积发芽和种子活力的影响。种植 Enlist(抗 2,4-D)大豆和 Xtend(抗麦草畏)大豆,并在第一次可见的雌性 Palmer 苋菜花序上施用 2,4-D 或麦草畏(含或不含草铵膦和/或草甘膦)的各种组合. 在 Enlist 大豆处理后 4 周,2,4-D + 草铵膦和 2,4-D + 草铵膦 + 草甘膦的混合物提供了最大的防治效果。同样,在 Xtend 大豆中,麦草畏+草铵膦和麦草畏+草铵膦+草甘膦的组合提供了最大的控制。生物量的最大减少来自生长素除草剂(2,4-D 或麦草畏)加草铵膦和草甘膦的组合。通过含有至少一个有效作用位点的处理方法,种子产量减少最多:一种生长素除草剂(2,4-D 或麦草畏)或草铵膦。与以前的研究相比,累积发芽和种子活力不受除草剂处理的影响。该研究表明生长素除草剂或草铵膦单独和组合在第一个雌花序施用时可降低棕榈苋菜的种子产量。
更新日期:2020-11-04
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