五种具内吸作用的杀虫剂防治山楂喀木虱的药效试验

通过用5种具内吸作用的杀虫剂,分别采用树干涂抹、基部钻孔注药和根施三种施药方法,进行了防治山楂树新害虫——山楂喀木虱(Cacopsylla sp.)的田间药效试验。结果表明5种药剂不同施药方法防治初孵若虫、成虫和老龄若虫均有良好的防治效果。树干涂药以50％久效磷乳油10倍、20倍、30倍液药效最好,其次是40％乐果和氧化乐果乳油10倍、20倍液。而树干基部钻孔注药和根施较费工、费药。因此,生产上以树干涂药防治该虫最佳,且以卵盛期防治为宜。

THE CONTROL OF CACOPSYLLA SP.WITH FIVE KINDS OF ABSORBEFACIENT INSECTICIDES

An experimrnt of controlling a new hawthorn past, Cacopsylla sp., was conducted with five kinds of absorbefacient insectieides and the following three methods: tree-body brushing, injecting tree base and putting insecticides on the roots. The results show that all the insecti-cides and methods used were effective to the young and old nymphs and adults of this pest. The 10, 20 and 30 times' dilution of monocrotophos 50%E. C. were better than ohters, and the 10 and 20 times dilution of dimethoate and omethoate 40%E. C. were also very good. As injecting tree base and putting pesticides on the roots of tha trees are waste os time and insecticides, brushing the tree body with insecticides should be empioyed during the egg-laying period of the pest.