稻田飞虱卵寄生蜂群落结构和动态的初步研究

报道了广东省四会市大沙镇稻田中褐飞虱Nilaparvata lugens卵期寄生蜂的结构和动态。该群落由缨小蜂科和赤眼蜂科的6个属、共19种卵寄生蜂组成。其中，稻虱缨小蜂Anagrus nilaparvatae、长管稻虱缨小蜂A. longitubulosus和拟稻虱缨小蜂A. paranilaparvatae是群落中的优势种群，它们对控制褐飞虱种群卵期的存活率起主要作用。6个属在群落中的优势地位相对稳定，但不同物种包括优势种类在群落中的地位并不稳定。早、晚稻前期，群落的寄生蜂数量与稻田褐飞虱数量正相关；中期，寄生蜂数量在一定的范围内波动；后期,其数量先上升,然后急剧下降。水稻生长前、中和后期，寄生蜂对褐飞虱卵的平均寄生率分别约为76%，70%和50%。

A preliminary investigation on structure and dynamics of egg parasitoid community on the brown planthopper in rice field

The hopper egg parasitoids, which could parasite eggs of the brown planthopper (BPH), were studied at community level. The communities were made up of 19 hopper egg parasitoids, which belonged to 2 families, Mymaridae and Trichogrammatidae. Three species, Anagrus nilaparvatae Pang et Wang, A. longitubulosus Pang et Wang and A. paranilaparvatae Pang et Wang, were the dominant species, had high percentage in the community, and took an important role in controlling BPH in rice field. The dynamics of different genera were relatively steady in the community, but the dynamics of species, even the domimant species, were not steady. The communities were positively related to the number of the brown planthopper in rice field during the early period, fluctuated in a certain range during the middle period, and increased then fell down greatly before harvesting, in both early and late rice growth. The percentages of BPH eggs with hopper egg parasitoids during the early, middle, and late period of rice growth were about 76%, 70%, and 50% respectively.