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上海郊区玉米螟主要在棉花茎秆,棉田枯铃、枯叶及棉仓晒花帘等处越冬。应用有效积温(玉米螟越冬代幼虫和蛹发育起点及有效积温)预测越冬代成虫发生期,其结果与实际发生情况基本相符。 一、越冬虫态的有效积温 1.越冬代幼虫:10月份取越冬代幼虫500—600条,分成8组,其中4组放在不同温度的温箱内,采用变温(温差为8℃),计算时用其平均值,其余4组放在7—8℃的冰箱内,
Shanghai suburbs corn borer mainly in the cotton stalks, cotton fields bell, dead leaves and cotton warehouse sun curtain and other winter. The effective accumulated temperature (starting point and effective accumulated temperature of larvae and pupae of overwintering corn borer) was used to predict the occurrence of overwintering adult adults. The results were in good agreement with the actual occurrence. First, overwintering insect effective accumulation of temperature 1. Overwintering on behalf of the larvae: October overwintering larvae 500-600, divided into 8 groups, of which 4 were placed in different temperature thermostat, using variable temperature (temperature difference of 8 ℃) Calculated with its average, the remaining 4 groups on the refrigerator at 7-8 ℃,