二点委夜蛾越冬场所调查初报

为了明确二点委夜蛾的越冬场所，为预测预报和防治提供科学依据，对玉米田、豆田、花生田、棉田、甘薯田等作物植株、地表和0~5 cm表土进行调查，记录二点委夜蛾幼虫的分布部位和数量。结果表明，在玉米植株苞叶、玉米田的麦秸和杂草下、豆田、棉田、花生田、甘薯田、冬瓜田植株下或落叶下、桃园、田边地头和废弃农田杂草下均发现有二点委夜蛾幼虫，以植株密度大、落叶多、地表覆盖程度高的棉田、豆田和花生田虫口密度高。说明二点委夜蛾食性杂，越冬场所复杂， 棉田、豆田、花生田和玉米田等多种作物田以及田间杂草均可为其越冬场所。

Preliminary report on investigation of the overwintering sites of Athetis lepigone

The overwintering sites of Athetis lepigone（M schler） were investigated to provide scientific basis for forecasting and control of the insect pest. Surveys on plants, fallen leaves, weeds and the 0-2 cm surface soils in corn, soybean, cotton, peanut, and sweet potato fields were carried on, and the location and number of A.lepigone larvae were recorded. The results showed that A.lepigone larvae were present in husks, underneath the decayed wheat straws and weeds in corn field, fallen leaves in cotton, soybean or peanut fields, and also in sweet potato and white gourd fields. The larvae of A.lepigone were also found underneath the weeds in peach garden, in abandoned fields and the edges of fields. More larvae were recorded in cotton, soybean and peanut fields with higher plant density, more fallen leaves and good ground coverage. It is concluded that the A.lepigone is a polyphagous insect pest. The overwintering sites of the pest are very complicated. The fields of soybean, peanut and corn as well as the weeds in the edges of farmlands could be the overwintering sites of A.lepigone.