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大螟Sesamia inferens(Walker)是我省区玉米和水稻生产上重要的害虫之一。为了有利于预测预报并指导防治,作者于1979至1981年在自然变温条件下,对大螟各虫态发育历期进行了观察,分析了历期与温度的关系,并测定了其发育起点温度和有效积温常数。 一、观察方法 采用田间系统调查与室内饲养观察相结合。 1.蛹历期 从越冬的秋玉米秆,晚稻桩内以及在各代发生期间,查获高龄幼虫,分别逐头编号投入1.5×25cm指形管中,置于室外百
Sesamia inferens (Walker) is one of the most important pests in maize and rice production in our province. In order to facilitate the forecast and guide the prevention and treatment, the authors observed the developmental stages of Sesamia inferens from 1979 to 1981 under the conditions of natural temperature. The relationship between the duration and the temperature was analyzed. The onset temperature And effective temperature constant. First, the observation method using field system surveys and indoor feeding observation combined. 1. Pupal period From autumn winter corn stalks, late rice piles and the generation occurred during the seizure of older larvae, respectively, head-by-head number into 1.5 × 25cm finger tube, placed in outdoor 100