不同药剂对稻纵卷叶螟的防治试验

在五(3)代稻纵卷叶螟2、3龄幼虫高峰期进行防治试验,结果表明,每667m2选用新农宝80 ml、功夫30~50 ml、纵卷清80g等对稻纵卷叶螟有优良的杀虫及保叶效果,可大面积推广应用。而杀虫单及螟盾(三唑磷) 的杀虫及保叶效果很差,因此,在田间稻纵卷叶螟幼虫3龄或3龄以上时不宜使用。

Controlling Effect of Different Insecticides to Cnaphalocrocis medinalis Guenee

Different insecticides were sprayed on paddy field to control larvae of Cnaphalocrocis medinalis Guenee when most larvae were in the 2nd to 3rd instar. Field test showed that Xinnongbao (40% chlorpyrifos EC) 80 ml/667m2, 2.5% cyhalothrin EC 30~50 ml/667m2 and Zhongjuanqing (35% acephate-chlorpyrifos WP) 80 g/667m2 obtained good results. Their rates of healthy leaf and larva death were higher among all test plots. Those insecticides should be largely applied on controlling the pest. Field test also showed that triazophos and monosultap could not control the larvae effectively, nor could protect leaves of rice as wish. So, they are not recommended to control the larvae at the age of older than 3rd instar.