“多效灵”对几种桑园害虫的防治效果

The Effect of "Duoxiaoling"on Preventing and Controlling Several Pests in Mulberry Field

多效灵是本所混配筛选出高效低毒桑树专用杀虫剂。对蚕残毒期为1000倍7天。多效灵1000倍田间对野蚕防效达94．6％，2000倍为92．1％，3000倍为83％；同样1000倍多效灵对野蚕、桑尺蠖、斜纹夜蛾平均效果为83．2％、敌敌畏为66％、双效磷为70％。

Duoxiaoling'is a high effective but less poisonous pesticide specially for mulberry trees, which was screened by our instltute. The period of residual toxicity to silkworm was 7 days, if 1000-fold of the insecticide was used. When 1000-fold, 2000-fold and 3000-fold of the pesticide was used, 94. 6%, 92.1% and 83% of the mulberry wide silkworms (Mandarina M.) could not survive respectively. Besides,the mean effectiveness of 1000-fold'Duoxiaoling' to wide silkworm,mulberry looper (Hemerophila atrilineata B.) and common cutworm (Prodenia litura F.) was 83. 2%, while that of DDVP (dichlorpos) and 'Shuangxiaolin' were 66% and 70% respectively.