一代棉铃虫种群动态及危害小麦的研究

A Study on the Population Situation and Harm of Cotton Bollworm to Wheat

通过对豫北辉县、新乡县、延津、卫辉等地棉铃虫的田间系统调查，基本摸清了一代棉铃虫在该地区的种群动态，即越冬平均密度为1．9头／m2，越冬代蛾盛期为各月底至5月初，幼虫3龄盛期在5月中旬。通过室内饲养观察了棉铃虫的活动危害习性．即1天的活动取食高峰呈不均称双峰型等；测定了幼虫的食量，2～6龄幼虫的日均食量分别为0．8粒，1．9粒，2．7粒，3．1粒，4．3粒。1头幼虫可完全破坏47.7粒小麦。在讨论中提出了对麦田棉铃虫发生危害与防治的几点看法。

By the systematic field trial of Cotton bollworms at Huixian city, Xinxiang county and so on, we found out the population situation of a generation of cotton bollworm in the area.And we also observed its destructiveness by breeding in doors, thus putting forward our viewpoint on the cause and control over cotton bollworm in wheat fields.