四代稻飞虱预测式的建立朱才荣（浙江桐乡市农林局病虫测报站３１４５００）稻飞虱是水稻生产上的主要害虫之一，我市以褐稻虱为主的第四、五代是为害晚稻中后期的主害代，常年经防治后，仍受稻飞虱危害而损失粮食多达上百万公斤，尤其是在大发生年份不防治、防治失时或防... Four generations of planthopper prediction formula establishment Zhu Cairong (Zhejiang Tongxiang City Agriculture and Forestry Bureau pests and diseases reporting station 314500) Planthopper is one of the major pests on rice production, the city of brown planthopper-based fourth and fifth generations are the victims Late rice in the late generation of the main generation, perennial after the prevention and treatment, are still subject to planthopper damage and loss of food up to millions of kilograms, especially in the year of occurrence of large non-control, prevention and control of lost time or prevention.