不同杀虫剂防治国槐尺蠖药效试验

通过试验研究了使用50%灭幼脲Ⅲ号胶悬剂和25%溴氰菊酯乳油对国槐尺蠖的防治效果,结果表明:50%灭幼脲Ⅲ号胶悬剂1 500倍和25%溴氰菊酯乳油2 000倍液防治效果最好;国槐尺蠖在北京昌平地区每年发生4代,5月中旬为防治第1代幼虫的最佳时期,6月中旬为防治第2代幼虫最佳时期,第3代后世代交替,可根据虫情在2~3龄幼虫期喷药。

Control Effect of Different Insecticides against Semiothisa cinerearia

The control effects of 50% dexamethasone III suspensions & 25% deltamethrin EC against Semiothisa cinerearia were studied.Result show that 50% dexamethasone III suspensions and 2 000 times 25% deltamethrin EC can obtain the optimal control effect;Semiothisa cinerearia occurred 4 generations a year geometrid in Beijing Changping Area;mid-May is the optimal period to control the first generation of larvae;mid-June is the optimal period to control the second generation of larvae;alternation of generations occur after the third generation;spraying insecticide can be conducted in the 2-3 instar larvae according to the insects.