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大豆二条叶是大豆常见害虫之一,近年来二条叶为害日趋严重,据我们1982～1986年五年间的调查研究,证实二条叶在黑龙江省一年发生两代,更正了前人的错误记载。在密山地区,越冬代成虫5月中旬出土活动,7月下旬8月上旬豆地出现第一代成虫,9月中旬豆地可见到第二代成虫,羽化得早的第二代成虫出土取食一段时间,然后入土越冬,羽化得晚的第二代成虫则不出土活动,直接在土壤中越冬。
Soybean two leaf is one of the common pests of soybeans, two leaf in recent years, the increasingly serious harm, according to our 1982 to 1986 five years of investigation and study, two leaf in Heilongjiang Province, one generation a year, corrected predecessors Wrong record. In Mishan area, the overwintering generation adults were unearthed in mid-May. The first generation of adults appeared in the field in late July and the second generation in late September, and the second generation adults emerged early in mid-September. For a period of time, the second-generation adults that emerge later in life are unearthed and wintering directly in the soil.