毒死蜱和甲基毒死蜱防治稻纵卷叶螟

Effect of Chjorpyrifos and Chlorpyrifos-Methyl to control r1ce leaf rol ler(Cnaphlocrois medinalis)in filed trial

防治稻纵卷叶螟田间小区药效试验结果表明，４Ｏ％毒死蜱和甲基毒死蜱乳油在稻纵卷叶螟卵孵盛期进行防治，均有优良的防治效果。每亩用４０％乳油５０毫升的相对防效在８５％以上；７０～１００毫升的防效可达９Ｏ％以上，持效期可达１０天以上。两者的药效和特效均优于每亩１００毫升５０％甲胺磷和２００毫升的１８％杀虫双。

The results of field experimet showed thatcmorpyrifos and cmorpyrifos-methy could be applied to con-trol the rice leaf roller(Cnaphalocrocis medinalis )with high ef-fect.Over 90%control could be abtained vvhen these insecti-cides were applied as foliage spray in a dosage of 75～100m1/mu in egg hatching staeg,The effect of control may sustainedto more than 10 days. The resuIt was better than those ofmetham1dophos and a new insecticlue Sha Chong Shuong.