几种杀虫剂对小菜蛾的田间防治效果

小菜蛾是十字花科蔬菜主要害虫.目前对小菜蛾的防治以化学防治为主.选用多种低毒药剂进行田间药效试验.结果表明:5％氯虫苯甲酰胺悬浮剂、150 g/L茚虫威悬浮剂、100 g/L虫螨腈悬浮剂和3％甲维盐乳油等4种药剂对小菜蛾的防效较好,防治效果均在80％以上.其中5％氯虫苯甲酰胺悬浮剂和150 g/L茚虫威悬浮剂的田间持效期较长,药后10d防治效果仍可保持在60％左右.

Field trials of several pesticides against Plutella xylostella

Plutella xylostella is one of the serious pests in Cruciferae vegetables.Pesticides are mainly used to control P.xylostella in the field.Several pesticides were chosen to test for their control efficacy through field trial.The results showed that 5% chlorantraniliprole SG,150 g/L indoxacarb SG,100 g/L chlorfenapyr SG and 3% emamectin benzoate EC had significant effect on P.xylostella,the control efficacy were all over 80% at the 1st day after treatment.5% chlorantraniliprole SG and 150 g/L indoxacarb SG had a long term effect in the field with its control efficacy being about 60% at the 10th day after treatment.