乐斯本对大蒜根蛆的防治效果及防治指标

Control Effect and Control Index of Chlorpyrifos on Root Vermicule of Garlic

[目的]为大蒜根蛆无公害防治阈值的制定提供理论依据。[方法]以大蒜为供试材料,分别采用不同浓度乐斯本(100、200、400、800 mg/kg)对其进行2次灌根处理,以虫蛀率为度量单位,研究不同处理对大蒜根蛆的防治效果。[结果]随着用药浓度的增加,乐斯本对根蛆的防治效果逐渐增强,400、800 mg/kg乐斯本处理对大蒜根蛆的防治效果分别为88.89%和90.90%,显著高于其他处理。从生产成本角度考虑,以乐斯本浓度400 mg/kg,用药2次为宜。为了减少根蛆为害,当虫蛀率达到11.89%时,即可用药剂防治。[结论]该研究确定了使用乐斯本防治大蒜根蛆的最佳用药浓度。

[Objective] The aim was to supply the theoretical basis for formulating non-public hazard control liminal value for root vermicule of garlic.[Method] With garlic as the tested materials,they were treated by chlorpyrifos with different concn.（100,200,400 and 800 mg/kg） by root irrigation for twice.With bitten rate was measurement unit,the control effects of different treatments on root vermicule of garlic were studied.[Result] As medication concn.was increased,the control effect of chlorpyrifos on root vermicule was strengthened gradually,the control effects of treatments with 400 and 800 mg/kg chlorpyrifos on root vermicule of garlic were 88.89% and 90.90% resp.,being significantly higher than that of other treatments;considering production cost,it was suitable to treat with 400 mg/kg chlorpyrifos for twice;to reduce damage of root vermicule,pesticide control could be used when the bitten rate reached 11.89%.[Conclusion] The optimum medication concn.of chlorpyrifos for controlling root vermicule of garlic was ascertained in this research.