Abstract: 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.

Key words: brown planthopper, egg parasitoid, community, structure, dynamics