草地螟是我国北方农牧业的重要害虫之一。一般在降雨频繁的年份,往往幼虫发生较重。反之成虫虽大量发生,但幼虫发生量很低。为了探讨环境湿度对草地螟成虫生殖力及卵孵化率的影响,从而为深入研究环境因素与草地螟种群数量变动之间的关系,以及为草地螟的预测预报提供一些可资利用的依据,我们作了如下试验。一、材料与方法1、材料来源:1985年8月在田间自然条件下罩笼饲养二代幼虫(幼虫食料为灰菜),经作 Meadow borer is one of the important pests of agriculture and animal husbandry in northern China. Generally in the years of frequent rainfall, larvae often occur heavier. In spite of the large number of adults, but the incidence of larvae is very low. In order to investigate the effect of environmental humidity on fecundity and egg hatching rate of adult Ostrinia sc and the relationship between environmental factors and the change of population of M. fortunei and to provide some available evidences for the prediction of S. fortunei, Made the following test. First, materials and methods 1, Source of material: August 1985 under the cage cage in the field of natural conditions, second-generation larvae (larvae foodstuffs for the gray vegetables), by