山东德州棉区1992年二代卵盛期达19天,比常年延长9—10天,形成二、三、四代接连发生,世代重叠。 二代百株有卵7000-8000粒,最高40730粒,三代平均百株有卵224粒,有虫150—160头。四代有卵450—600粒,有虫100余头。各代虫卵量之多是历史罕见的。 麦田发生占植麦面积的85％;玉米、大豆、花和杂草上的虫量,均比常年多6—8倍。一般棉田全年用药12—14遍。 Dezhou cotton area in 1992, the second generation of eggs peaked for 19 days, 9-10 days longer than usual, the formation of two, three, four generations occurred one after another, generations overlap. The second generation of one hundred eggs 7000-8000, the highest 40730, three generations of an average of 224 eggs 224, a worm 150-160. Four generations of eggs 450-600 tablets, more than 100 worms. The amount of eggs in all generations is rare in history. Occurred in the wheat field accounted for 85% of the area of ​​wheat; corn, soybean, flowers and weeds on the amount of 6-8 times more than usual. General cotton field throughout the year 12-14 times.