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(一)棉虫生物防治除特殊情况外,事实证明在农业生态系中长期药杀各种害虫,而不利用捕食物,寄生物或病原物等原始型生物防治是难以凑效的。虽然生物防治在综合防治中,仍未强调为一种重要的手段,但最近十年一直重视天敌对扑灭害虫或潜在害虫时的重要性。利用天敌进行综合防治常采取(a)输入外地天敌(通常引自害虫的原产地),(b)利用害虫寄主,环境,和天敌三者关系,助长当地天敌的作用更为有效。上面(a)条(古典的生物防治)看做是对各种害虫防治技术中最有效的一种;但近年来对调查能控制棉虫的外
(1) Biological Control of Cotton Moths Except for special cases, it is proved that long-term pesticide killing of various pests in agro-ecosystems can not be achieved without the use of primitive biological control measures such as catches, parasite or pathogen. Although biological control has not been emphasized as an important tool in comprehensive prevention and control, the importance of natural enemies in suppressing pests or potential pests has been emphasized for the past decade. The use of natural enemies for integrated control often takes (a) the importation of natural enemies of the field (usually from the pest’s origin), (b) the use of host pests, environment and natural enemies to promote the role of local natural enemies more effectively. Article (a) above (classical biological control) is considered to be the most effective one for various pest control technologies; however, in recent years, investigations have been conducted to control cotton insects