转Bt基因抗虫棉田斜纹夜蛾的发生特点

20 0 3年斜纹夜蛾对转Bt基因抗虫棉叶片和生殖器官的危害已经超过常规棉 ,百株虫量是常规棉的近 4倍。原因主要有 3个方面 :一是转Bt基因抗虫棉对斜纹夜蛾幼虫的发育历期、蛹历期、成虫寿命及蛹重没有显著影响 ;二是斜纹夜蛾取食转Bt基因抗虫棉叶后雌性比例、产卵率和产卵量较高 ;三是斜纹夜蛾的发生与棉株营养有密切的关系 ,表现为随着施氮量和磷钾肥配比的提高 ,百株虫量增加。表明在施氮量和磷钾肥配比较高的田块 ,要更加重视斜纹夜蛾的防治。

Preliminary Research on the Incidence Characteristics of Prodenia litura (Fabricius) in Bt Transgenic Cotton Field

The harm to Bt transgenic cotton leaves and reproductive organs caused by Prodenia litura (Fabricius)was greater than that to non-transgenic cotton.The number of larvae per 100 transgenic cotton plants was four times more than that in on non-transgenic cotton plant.There were 3 reasons that may lead to:①there was no obvious difference between "Kemian-1" and "Yumian-1" in the rate of damage to leaves, flowers and buds due to Prodenia litura(Fabricius),②Prodenia litura (Fabricius) fed on Bt transgenic cotton leaves had a higher ratio of female to male,a higher ovipositing ratio and more eggs,and ③ the incidence of Prodenia litura(Fabricius) had a close relationship with the vegetative condition of cotton plants. Close attention must be paid to the chemical control of Bt transgenic cotton and especially more nitrogen, phosphorous and potassium are applied.