8月下旬正是第四代棉铃虫和棉蓟马发生危害的时期,应以生物生态和诱杀控制为主,化学防治为辅。 化学防治 当百株1～2龄棉铃虫幼虫达到15～20头,即为发生较重,用40％辛硫磷1000倍液喷雾防治,兼治其它害虫并扫残。当达到百株1～2龄棉铃虫有10头时,可以用35％硫丹1000倍液防治。为保护利用天敌,少量残虫提倡人工捕捉。 The end of August is the fourth generation of cotton bollworm and thrips thrips harm the period should be based on bio-ecology and trapping control, supplemented by chemical control. Chemical control When one hundred to one or two instar cotton bollworm larvae reached 15 to 20, that is heavier, with 40% phoxim 1000 times spray prevention and treatment of other pests and sweep the disabled. When reaching 100 strains of 1 to 2-year-old cotton bollworm 10, you can use 35% endosulfan 1000 times prevention and control. To protect the use of natural enemies, a small amount of residuals promote artificial capture.