不同寄主对棉铃虫生长发育及种群动态的影响

Effect of Cultivated Host Plants on Development and Population Dynamics of Cotton BollwormH

在恒温（２７℃±１℃）、恒湿（７０±５）％ＲＨ条件下，研究了棉花、玉米、大豆、花生、芝麻５种寄主对棉铃虫生长、发育和繁殖的影响。结果表明，在不同寄主及其不同部位上取食的棉铃虫，其发育历期、蛹重、存活率、成虫的繁殖力和寿命均有显著差异；棉铃虫在玉米、大豆等作物上的密度较高，且不同作物上的幼虫发育参差不齐。作者认为，田间多种作物并存的局面是造成棉铃虫世代混杂、防治困难及猖獗危害的原因之一。

The effect of 5 cultivated host plants (cotton,corn,bean,peanut and sesame)on the development and reproduction of cotton bollworm Helicoverpa armigerawere studied under constant temperature (27±1℃)and relative humidity(70%±5%).The results showed that there were significant differences of the development duration,pupa weight,survival rate,fecundity and longevity of adults among the cotton bollworms feeding on different host plants.The densities of cotton bollworm in corn,bean and other crops were higher,and the larvae development on different crops were irregular when investigated in the field, consequently.It was one of the reasons for generation confusion,control difficulty and severe demage of cotton bollworm that many crops coexisted in the fields.