18%2,4-滴微乳剂防治非耕地薇甘菊田间药效试验

【目的】明确18%2,4-滴微乳剂对非耕地薇甘菊的防治效果,为其推广应用提供科学依据。【方法】设18%2,4-滴微乳剂540.0、324.0、202.5和162.0 g a.i./ha 4个处理,与常用化学除草剂41%草甘膦异丙胺盐水剂推荐剂量1845.0 g a.i./ha及空白对照处理进行比较,在薇甘菊生长旺期施药,并于药前和药后15、30 d调查薇甘菊覆盖度,药后45 d调查薇甘菊覆盖度和鲜重,计算薇甘菊覆盖度防效及鲜重防效,2009、2010年两年重复试验。【结果】18%2,4-滴微乳剂在供试剂量下对薇甘菊有良好的防除效果,其中162.0~202.5 g a.i./ha剂量处理后45 d对薇甘菊覆盖度防效达97.74%~100.00%,鲜重防效达98.80%~100.00%,显著高于对照药剂处理的防效。【结论】18%2,4-滴微乳剂可有效防除非耕地薇甘菊,推荐使用剂量为162.0~202.5 g a.i./ha。

Field trials of 18%2,4-D micro-emulsion against Mikania micrantha in non-cultivated land

Objective]The control effect of 18%2,4-D micro-emulsion(ME) against Mikania micrantha in non-cultivated land was determined to provide references for its application and promotion. Method]Four different treatments of 18%2,4-D ME (540.0, 324.0, 202.5 and 162.0 g a.i./ha) were sprayed on Mikania micrantha leaves at peak growth stage to compare their control effects with recommended levels of common chemical herbicide (glyphosate isopropyl amine salt aqueous solution 1845.0 g a.i./ha) and the control . The coverage of Mikania micrantha before and after spraying 15 and 30 days, and the cover-age and fresh weight of Mikania micrantha after spraying 45 days were measured to calculate the control efficiency. The experi-ment was repeated for two years (2009 and 2010). Result]All the dosages of 18% 2,4-D ME in the experiments showed great control effects on Mikania micrantha. The control effects of 162.0-202.5 g a.i./ha of 18%2,4-D ME on coverage and fresh weight of M. micrantha in non-cultivated land were 97.74%-100.00%and 98.80%-100.00%on 45th day, which were signifi-cantly higher than that of the control herbicide. Conclusion]Due to good control effect, 162.0-202.5 g a.i./ha of 18%2,4-D ME could be recommended to control Mikania micrantha in non-cultivated land.