我县近年来由于推广大叶矮杆良种,变革耕作制度,提高施肥水平,以及滥用农药等原因,水稻病虫为害日趋严重,稻飞虱、稻纵卷叶螟上升为主要害虫,由原来发生危害的几千亩,几万亩,发展到十多万亩。害虫猖獗,农药用量剧增,虽然获得一定的防治效果,但却带来了一系列的付作用。如长效农药造成对农作物和环境的污染;杀死害 In recent years, due to the promotion of big-leaf dwarf breeds, change of farming system, improvement of fertilization level, and abuse of pesticides, the damage of rice in pests and diseases is becoming more and more serious. The rice planthopper and rice leaf roller climb up as the main pests, Hazardous acres, tens of thousands of acres, developed to more than ten acres. The rampant pests and the sharp increase in the amount of pesticides have achieved a certain degree of control effect, but they have brought a series of pay-off effects. Such as long-term pesticides cause pollution of crops and the environment; kill harm