抗虫棉田棉铃虫发生动态及综合防治策略

通过对德州市1997—2005年抗虫棉棉铃虫发生情况的系统调查和数据分析,表明抗虫棉对各代棉铃虫有较好的控制作用,但防治压力仍然较大,其他寄主田已成为棉田棉铃虫的主要虫源基地。种群数量的消长主要受气候、虫源、食料、天敌、及防治状况等综合影响。防治策略上,对二代棉铃虫要适当施药防治,对三、四代棉铃虫应注重施药防治,重点保护棉花蕾铃;同时,注重对玉米、花生、大豆、辣椒及蔬菜田棉铃虫的防治,减轻棉田防治压力,全面压低棉铃虫种群数量。

The population dynamic and management strategy of Helicoverpa armigerain insect-resistant cotton field

The control power of the insect-resistant cotton to cotton bollworm was proved through the systematic investigation and analysis of population dynamic of cotton bollworm from 1997 to 2005.Protection stress was still great however in that the exotic cotton bollworm had become the main source of cotton fields.Population dynamics of cotton bollworms were mostly influenced by climate,insect sources,food supply,natural enemy and protection situation.Pesticide should be used appropriately in preventing the second insect generation,heavier in preventing the third and the fourth generation to protect cotton bud.Meanwhile,prevention on cotton bollworms in corn,peanut,soybean,capsicum and vegetable fields should be done to lighten the prevention stress of cotton field and lower the amount of cotton bollworm population.