棉铃虫寄主植物种类及其适合性程度

通过江苏淮南、淮北棉区棉铃虫寄主植物种类凋查,已查明60种栽培植物、34种野生植物为棉铃虫寄主,它们分属24个科,其中以禾本科、豆科、菊科、葫芦科、十字花科、锦葵科、百合科、旋花科、藜科种类居多。运用选择系数法和适合性指数法定量测定了30种常见寄主植物对棉铃虫的适合性程度,建立了选择强度与适合性程度估测模型,据此将棉铃虫众多寄主划分为适宜寄主、较适宜寄主与次要寄主三大类。并在上述工作基础上,结合寄主植物种植面积情况,明确了各代次棉铃虫主要栽培寄主种类,以优化棉铃虫测报与防治技术。

STUDIES ON THE HOST PLANT SPECIES AND THEIR FITNESS TO COTTON BOLLWORM

The host plant species of cotton bollworm Helicoverpa armigera Hubner in the cotton regions south and north of Huaihe River Valley in Jiangsu Province were investigated. 60 cultivated and 34 wild plant species under 24 families were determined as the host plants of H. armigera ,in which those in Gramineae,Malvaceae,Leguminosae, Solanaceae,Cucurbitaceae, Compositae ,Cruciferae and Chenopodiaceae were dominant. The goodness of fit of 30 common host plants to cotton bollworm were, tested quantitatively with selective coefficient and fitness index methods, and models for estimating their attractiveness and fitness level were established. Accordingly, the host plants of cotton bollworm have been divided into three categories;the most suitable,suitable and secondary. In association with the local layout of crops during different generations, the main crop species in each generation of cotton bollworm were determined. The results of this study are available for optimizing the forecast and control techniques of this insect pest.