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在辽宁省西丰县、岫岩县,通过17年来长期连续坚持利用松毛虫赤眼蜂大面积防治第1代玉米螟试验结果表明,发现自大面积放蜂治螟以来,玉米螟一代卵期赤眼峰的自然寄生率逐年提高,至今已达(?)O％左右;1、2代玉米螟幼虫和蛹的各种寄生性天敌的自然寄生率也逐年显著提高,由此使一代玉米螟的为害也逐年显著减轻,自80年代以来玉米被害率稳定于10％左右。测定玉米种籽和土壤样品表明:六六六、DDT和1605农药的残留量有所缓解,使天敌种群数量逐步回升,进而加强了这些天敌、对1,2两代玉米螟的自然控制作用,解决了玉米蝶的危害,促使农业生态系统向良性循环发展,达到在较长时期内玉米螟种群数最相对稳定在较低的动态平衡水平上。
In Xifeng County of Liaoning Province, Xiuyan County, through 17 years of long-term continuous use of Trichogramma Trichogramma large area prevention and control of the first generation of corn borer test results showed that since the large area of the bee-eater, The natural parasitic rate of eye peak has been increasing year by year, and up to now, the natural parasitism rate of various parasitic natural enemies of larvae and pupae of 1st and 2nd generation corn borer also increased significantly year by year, Harms also significantly reduced year by year, since the 1980s the rate of corn damage stabilized at about 10%. The determination of corn seed and soil samples showed that the residues of 666, DDT and 1605 pesticides were eased and the population of natural enemies gradually rose, further strengthening the natural control of these natural enemies on the first and second generations of Ostrinia furnacalis, Solve the harm of corn butterflies, and promote the development of agro-ecosystem to a virtuous circle, and achieve the relative stability of the corn borer population at a relatively low level of dynamic equilibrium over a longer period of time.