非稻田生境中稻飞虱卵寄生蜂群落结构研究

研究发现稻田周围田埂、路边禾本科杂草上栖息着能寄生于稻飞虱卵的寄生蜂有缨小蜂科和赤眼蜂科两类,它们是非稻田生境中稻飞虱卵寄生蜂群落的重要成员.群落中,缨小蜂科数量较多,其四个属中,数量上Anagrus＞Gonatocerus＞Neurotes＞Mymar;赤眼蜂科数量较少,所占比率小于9%.非综防区化学农药的毒性和残效加重了生境中寄生蜂生存压力,造成群落中多个物种占有优势地位,而稻飞虱主要天敌-缨小蜂的优势被削弱,不如综防区群落中缨小蜂的优势地位突出.

STUDIES ON THE STRUCTURE OF EGG- PARASITOID COMMUNITY OF RICE PLANTHOPPER IN NON- RICE HABITAT

Two main groups of rice planthopper egg parasitoids were found in bunds and roadside vegetation near rice fields: Mymaridae and Trichogrammatidae. These parasitolds in non - rice habi- tat made up species pool of rice planthopper esa parasitoid. Among the communities, the most nu- merous genus is Anagrus. The order of number were as follows: Anagrus > Gonatocerus > Neu- rotes > Mymar. Trichgrammatidae was always less 9%. In non - IPM rice ecosystem, there are more dominant species on bunds and roadside vegeta- tion than in IPM ecosystem. However, percentage of the dormant species in non - IPM rice ecosys- tem was less than that in IPM ecosystem. The controlling ability of Inain natural enemies for hopper was the weakened, due to the toxicity and long persistence of insechcides deteriorate the habitats of agrosystem.