为了明确二点委夜蛾越冬虫态及其空间分布,为二点委夜蛾的预测预报提供科学依据,通过对模拟大田自然环境观测区和大田环境下不同类型作物田二点委夜蛾越冬情况的系统调查,明确了二点委夜蛾是以休眠的老熟幼虫结一土茧或叶茧越冬,在空间分布上主要是在地表,占越冬幼虫的77％以上,部分叶茧在覆盖物中越冬.棉田、花生田、豆田、药材田、杂草地等多种田块的残留秸秆枝叶覆盖地为其越冬场所.棉田、豆田、杂草地的越冬存活率研究表明,棉田越冬存活率相对较大,秸秆覆盖厚度对存活率影响不显著.%The overwintering developmental stage of Athetis lepigone and the spacial distribution in overwintering sites were investigated to provide the scientific basis for forecasting and control of the insect pest. Surveys in simulated environment of overwintering sites and the overwintering sites of A. Lepigone under natural conditions were carried out. The results showed that the overwintering developmental stage of A. Lepigone was the dormant and full-grown larvae in cocoons mixed with soils and residues of fallen leaves. Over 77% of A. Lepigone cocoons were mainly laid in soil surface with the coverage of fallen leaves and branches, and the others in fallen leaves. The fields of cotton, peanut, soybean and so on, as well as the weeds in the edge of farmlands, were the overwintering sites of A. Lepigone. The survival rate of the overwintering larvae of A. Lepigone was the highest in the cotton, soybean and weeds in simulated environment. Thickness of coverage of fallen leaves and straws did not affect the survival of overwintering A. Lepigone larvae.
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