稻田生境调节和捕食性天敌对稻飞虱的控制作用

BIOLOGICAL CONTROL OF RICE PLANTHOPPER BY HABITAT MANIPULATION AND ARTHROPOD PREDATORS IN DASHA TOWNSHIP

广东省四会市（县）大沙镇（区）１９７３年开展以发挥天敌作用为主的水稻害虫综合防治，２０多年来稻飞虱一直没有大发生，且发生程度低于临近地区。本文试图从理论上解释这一现象。通过改善天敌的生境条件，捕食性天敌群落种库中天敌的种类和多样性增多，天敌群落重建和发展的能力增强，重建后群落的种类、数量和多样性均高于临近地区，最终使得天敌群落对稻飞虱的控制作用增强，９８％以上的稻田稻飞虱的数量常在防治指标以下。

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 rebuilding and development is enhanced.Thus,the rebuilt community has more species richness and higher predator density and diversity.As a result of the role of natural enemies,rice planthopper is always lower than the economic threshold level in 98% in rice fields.