稻田稻飞虱卵寄生蜂群落的重建和维持

研究了综防区和非综防区稻田飞虱卵寄生蜂群落的重建和维持。结果表明：早稻生长期，稻虱缨小蜂Anagrus nilaparvatae 和拟稻虱缨小蜂 A. paranilaparvatae 在水稻移栽后第9天进入综防区稻田，在第13天进入非综防区稻田，同在第21天完成群落重建，重建速率分别是0.28种/天和0.21种/天。晚稻生长期，综防区和非综防区稻虱缨小蜂和拟稻虱缨小蜂均在水稻移植后第1天进田，至第21天完成群落重建，重建速率分别是0.12种/天和0.04种/天。维持阶段综防区群落较非综防区稳定。群落重建和维持受温度、种库中卵寄生蜂种类和数量、种库距稻田的远近、稻田中害虫种类和数量以及害虫防治策略的影响。

An investigation on dynamics of egg-parasitoid community on planthopper in ricearea in South China

Reestablishment and maintenance of the egg-parasitoid community on rice planthopper were monitored in Dasha Town and Dinghu District, Guangdong Province in 1996. During the first rice season, Anagrus nilaparvatae and A. paranilaparvatae appeared in IPM paddy in Dasha and in non-IPM paddy in Dinghu on the 9th and 13th day after transplantation of seedlings respectively. The reestablishment finished on the 21st day in both the two types of rice areas. The rate of reestablishment was 0.28 species and 0.21 species per day in IPM and non-IPM area respectively. During the second rice season, A. nilaparvatae and A. paranilaparvatae were found on the day of transplantation and the community reestablishment ended on the 21st day in both the rice areas. The rate of reestablishment was 0.12 specie and 0.04 species per day in IPM and non-IMP area respectively. During most of rice growing period, the parasitoid community was steadier in IPM area than in non-IPM area. The reestablishment and maintenance was influenced by temperature, species and number of the parasitoids in species pools, the distance from species pools, the insect pest species and the regimes of pest control.