Biological control of rice insect pest is an important component of an IPM program. There are many species of natural enemies which contribute to the suppression of rice pest populations below economic injury levels. In order to use biological control more efficiently, it is a need to identify beneficial species and determine their roles in possible regulation of insect pests. There is a rich complex of biological control agents in rice and bund. This research was carried out to investigate the population density of insect pests and natural enemies in the rice field and bund. A total of 7 pest species and 15 natural enemy species were collected in the rice field. 10 pest species and 20 natural enemy species were collected in the bund, also. Changes in population density of insect pests and its prey were investigated in the rice field and bund. Population densities of insect pests were low at any time during the rice growth period in the field. This could be the high density of natural enemies. Bunds served as refuge for natural enemies when rice maturity. There are rich complex of biological control agents in rice field and bund. So, when we practice integrated pest management(IPM) of rice insect pests, we should use various natural enemies.

• Geon-Hwi Lee(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Chae-Hoon Paik(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Tae-Hwan Noh(Department of Rice and Winter Cereal Crop, NICS, RDA)
• Hyeong-Kwon Shim(Department of Rice and Winter Cereal Crop, NICS, RDA)