褐稻虱是金华地区晚稻中后期主要害虫,而近几年来自背稻虱的发生量也逐年增加。为了控制稻虱成灾,自六十年代后期以来曾耗用大量农药,频繁施药,用于防治稻虱的农药要占全年使用杀虫剂农药的60％左右。由于大量使用有机氯、有机磷杀虫剂,害虫抗药性增强,引起害虫的再猖獗。 Brown planthopper is the main pest of late rice in Jinhua area, but the occurrence of backfly in the recent years also increases year by year. In order to control the infestation of planthoppers, a large number of pesticides have been consumed since the late 1960s and are frequently applied. Pesticides used for the control of planthoppers account for about 60% of the pesticides used throughout the year. Due to extensive use of organic chlorine, organophosphate pesticides, pest resistance increased, causing the re-rampant pests.