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近年来,随着耕作制度的改革,我区夜蛾科害虫为害逐年加重。经初步调查,结果是:一、地老虎:我区各县均有发生。常发种有警纹地老虎、黄地老虎、小地老虎。景太、天祝、古浪等县以黄地老虎为主,以景太为例,黄地老虎占57.5%,小地老虎占34.6%,警纹地老虎很少。而在武威、永昌、民勤等县,则以警纹地老虎为主,以武威为例,警纹地老虎占71.4%,黄地老虎占14.7%,小地老虎则很少发生。这三种地老虎一年都发生两代,以一代幼虫为害为主,以老熟幼虫或蛹越冬。主
In recent years, with the reform of the tillage system, pest insects in our district increased year by year. After a preliminary investigation, the result is: First, the land tiger: I County districts have occurred. Often a species of warning tiger, yellow tiger, small tiger. King too, Tianzhu, Gulang and other counties to yellow tiger-based, King too, for example, yellow tiger accounted for 57.5%, small tiger accounted for 34.6%, little tiger pattern. In Wuwei, Yongchang, Minqin and other counties, the police pattern to the main tiger to Wuwei, for example, police tattooed tiger accounted for 71.4%, yellow tiger accounted for 14.7%, small tiger is rare. Three generations of tigers occur two generations a year, mainly to the first generation larvae, overwintering with mature larvae or pupae. the Lord