在亚洲和太平洋地区,褐稻虱Nilaparvata In-gens(Stal)是著名的重大害虫,它常常突然爆发,刺吸植株汁液,对水稻造成毁灭性的危害。同时,最近在东南亚褐稻虱已被证实为禾本科矮化病毒病的传毒煤介。应用杀虫剂是目前防治褐稻虱的有效方法,但是,在热带地区整年中害虫世代重叠,要把它的密度控制到经济危害水平以下,必须反复用药,这种方法是不经济的。此外,从生态学观点看来,大量使用化学农药,是不理想的,因为杀伤天 In Asia and the Pacific, Nilaparvata In-gens (Stal), a notorious pest, often breaks out suddenly and pierces plant juice, causing devastating damage to rice. In the meantime, brown planthopper recently demonstrated in Southeast Asia has been a toxicant to the disease of gramineous dwarf virus. Application of insecticides is currently an effective method of control of brown planthopper, but it is uneconomical to control the density of pests throughout the year in the tropics to control their density below the level of economic harm, necessitating repeated use. In addition, from the ecological point of view, the heavy use of chemical pesticides is not ideal, because the killing days