七种农药对茴香薄翅野螟防效研究

用喷雾法防治油菜田茴香薄翅野螟，结果表明：0.5%甲氨基阿维菌素苯甲酸盐微乳剂、4.5%高效氯氰菊酯乳油、2.5%高效氯氟氰菊酯乳油和200 g/L氯虫苯甲酰胺悬浮剂4种农药对茴香薄翅野螟的防效随着施药次数增加而增加；40%灭多威可溶性粉剂和25%杀虫双水剂的防效随着施药次数的增加防效逐渐下降； 48%毒死蜱乳油在不同施药次数下防效变化幅度较小，平均防效在95.85%左右；上述7种农药喷施1次后， 以48%毒死蜱乳油和40%灭多威可溶性粉剂的防效最好，分别达96.03%和94.82%。4.5%高效氯氰菊酯乳油、2.5%高效氯氟氰菊酯乳油和48%毒死蜱乳油喷施2次和3次时的防效都在95.70%左右。

Control efficacy of seven insecticides to Evergestis extimalis

Evergestis extimalis Scopoli was controlled in the field by spraying. The results showed that the control efficacy of 0.5% emamectin benzoate microemulsifier, 4.5% beta cypermethrin emulsifiable concentrate, 2.5% cyhalothrin emulsifiable concentrate and 200 g/L chlorantraniliprole suspension concentrate increased with increase of the spray times. On the contrary, the control efficacy of 40% methomyl soluble powder and 25% dimehypo aqueous solutions decreased. The range of control efficacy of 48% chlorpyrifos emulsifiable concentrate was narrow with different spray times , approximately 95.85%. The control efficacy of 48% chlorpyrifos emulsifiable concentrate and 40% methomyl soluble powder was best in seven insecticides by spraying one time. They were 96.03% and 94.82%, respectively. The control efficacies of 4.5% beta cypermethrin emulsifiable concentrate, 2.5% cyhalothrin emulsifiable concentrate and 48% chlorpyrifos emulsifiable concentrate were approximately 95.70% by spraying one time or two times.