治褐飞虱,要根据褐飞虱的发生和危害特点,适期用药,并根据田间褐飞虱的发生情况选用适当的杀虫剂。褐飞虱的发生和危害特点褐飞虱为迁飞性害虫,在北纬25°以北不能越冬,每年虫源逐代、逐区、呈季节性南北往返迁移。在长江流域及其以北地区,褐飞虱一般在7月中下旬以后迁入,通常在台风等由南向北的气流过境时形成迁入峰。每次迁入的成虫,数量一般不会特别 The treatment of brown planthopper, according to the characteristics of the occurrence and harm of brown planthopper, the appropriate medication, and according to the occurrence of brown planthopper in the appropriate selection of pesticides. Nilaparvata lugens (BPN) Occurrence and Harmfulness Nilaparvata lugens (BPH) is a migratory pest that can not winter in the north of latitude 25 ° North America. Nilaparvata lugens generally migrate after mid-to-late July in the Yangtze River Basin and its northern region, and usually form an immigration peak when a typhoon or other air current flows from south to north. The number of adults that move in each time will not be special