Since 1973,an integrated management of rice pests has been carried out in Dasha Township;it was put first to fully play the role of native natural enemies.The rice planthopper has never outbroken and its occurrence degree has always been lower than that at nearby regions.This paper tries to explain this phenomenon.Through postive habitat manipulation in Dasha Township,the species pool of the arthropod predator community has the largest types of species and the highest diversity;the community's capacity for ...