二化螟食性杂,越冬场所多。认真摸清它在各越冬场所的有效虫量,是搞好一代发生量预测和正确估计一代为害程度的重要依据。据调查,在稻桩中越冬的未成熟幼虫,翌年春暖后分别有77.4％和14.9％的幼虫转入油菜、红花等春花作物中继续为害;红花 Stem boreal diet, overwintering places and more. Earnestly find out the effective amount of insects in each overwintering place is an important basis for improving the generation forecast of the generation and correctly estimating the degree of harm done by the generation. According to the survey, immature larvae that overwintered in rice piles continued to have 77.4% and 14.9% of the larvae transferred to rape and saffron flowers respectively after the spring and autumn the following year.