稻飞虱为穗期暴发性害虫，是我县杂交稻制种田害虫之首。为害最重的是五（3）代（褐、白飞虱混合种群以褐飞虱为主），此代若虫盛发期正值制种乳熟期，危害重，损失大。据经验，在2～3龄若虫高峰期（8月25日左右）防治效果最好。方法是：用25％扑虱灵可湿性粉剂每亩25～35克或2 Planthopper is an outbreak of pests in the spikes, is the first hybrid rice farming pests in our county. The most serious damage is five (3) generation (brown, white planthopper mixed population of brown planthopper-based), the generation of nymphs at the stage of positive breast-milk seed production period, endanger heavy, large loss. According to experience, in 2 ~ 3 instar nymphs peak (August 25 or so) the best control effect. The method is: Use 25% Pu Lu Ling WP 25 ~ 35 grams per acre or 2