ANTAGONISM OF GLYPHOSATE TOXICITY TO JOHNSONGRASS (SORGHUM-HALEPENSE) BY 2,4-D AND DICAMBA
ANTAGONISM OF GLYPHOSATE TOXICITY TO JOHNSONGRASS (SORGHUM-HALEPENSE) BY 2,4-D AND DICAMBA
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DOI：
10.1017/s0043174500072660
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发表时间：
1989-09-01
期刊：
影响因子：
2.5
通讯作者：
BARRETT, M
中科院分区：
文献类型：
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作者：
FLINT, JL;BARRETT, M
进行温室研究以确定当草甘膦与2，4-D或麦草畏混合施用时减少约翰逊草控制的基础。将草甘膦以0.28、0.56、0.84和1.12 kg/ha单独施用于约翰逊草，并与2，4-D或麦草畏以0.14、0.28、0.14或0.56 kg/ha组合施用。当草甘膦与2，4-D（0.28 kg/ha草甘膦）或麦草畏（0.28 kg/ha或0.56 kg/ha草甘膦）一起施用时，在处理后4周测量的约翰逊草茎和根鲜重高于在这些比率下单独施用草甘膦。在一些较高草甘膦施用量与2，4-D（0.56或0.84 kg/ha草甘膦）或麦草畏（0.84或1.12 kg/ha草甘膦）的组合中，未观察到约翰逊草控制的拮抗作用。当将四种形式的2，4-D或两种形式的麦草畏添加到草甘膦喷雾混合物中时，草甘膦对约翰逊草的活性降低。2，4-D或麦草畏的存在降低了约翰逊草叶片对草甘膦的吸收和随后向根部的转运。草甘膦与2，4-D或麦草畏联用时，草甘膦的吸收和转运减少是降低其对约翰逊草毒性的原因。
Greenhouse studies were conducted to determine the basis for reduced johnsongrass control when glyphosate was applied in mixtures with 2,4-D or dicamba. Glyphosate was applied to johnsongrass at 0.28, 0.56, 0.84, and 1.12 kg/ha alone and in combination with 2,4-D or dicamba at 0.14, 0.28, 0.14, or 0.56 kg/ha. Johnsongrass shoot and root fresh weights measured 4 weeks after treatment were higher when glyphosate was applied with 2,4-D (0.28 kg/ha glyphosate) or dicamba (0.28 kg/ha or 0.56 kg/ha glyphosate) compared to glyphosate applied alone at these rates. The antagonism of johnsongrass control was not observed with combinations of some of the higher glyphosate rates with 2,4-D (0.56 or 0.84 kg/ha glyphosate) or dicamba (0.84 or 1.12 kg/ha glyphosate). The reduction of glyphosate activity on johnsongrass occurred when any of four forms of 2,4-D or two forms of dicamba were added to the glyphosate spray mixture. Glyphosate uptake intake into johnsongrass leaves and subsequent translocation to the roots was reduced by the presence of 2,4-D or dicamba. The reduced glyphosate uptake and translocation could account for the decreased toxicity of glyphosate to johnsongrass when applied with 2,4,-D or dicamba.