小菜蛾是蔬菜生产中的常见害虫。近年来,由于受暖冬和少雨干旱天气的影响,小菜蛾越冬基数大,自然死亡率低,导致蔬菜种植区为害加重。发生规律。小菜蛾在江淮地区1年发生6￣8代,并世代重叠发生,以成虫和蛹在蔬菜或残株落叶及杂草上、土缝内越冬,成为翌年的虫源。越冬蛹于4月上中 Plutella xylostella is a common pest in vegetable production. In recent years, due to the influence of warm winter and dry weather, the diamondback moth overwinter the base and the natural mortality rate is low, resulting in aggravation of the vegetable planting area. Laws occur. Plutella xylostella occurs in 6 ~ 8 generations a year in Jianghuai area and overlaps with each other in generations. Adult and pupae winters on the deciduous leaves and weeds of vegetables or stubs, and soil windings become winged in the following year. Overwintering pupae in April on the middle