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低温天气用灭多威硫双威药须知药性
date:2020/9/21   

     由于冬季或早春气温较低,在防治小麦蚜虫、红蜘蛛等害虫时,喷洒氧化乐果比乐果效果要好。这是因为,乐果对害虫的毒杀效力随温度的下降而显著减弱,而氧化乐果的药效受温度影响较小,即使在较低的温度(15℃以下)下,也能发挥其正常的杀虫作用。与氧化乐果相似的还有杀灭菊酯,这种杀虫剂在低温(15℃)下的毒效反而比在高温 (25℃)下更高。

 



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