We analyzed the variation in occurrence time and intensity of attacks by the rice stem borer (Chilo suppressalis Walker) on several crops. We found similar occurrence patterns of C. suppressalis in different crops. Overwintering larvae showed no difference in pupal period and weight compared to the non-overwintering ones. However, the larval period was reduced to 19.1 days in Miscanthus field, in contrast to that in the paddy fields. Efficiency of the emergence trap was confirmed to be greater than that of the delta trap for capturing C. suppressalis adults. It is necessary to adjust the control period because of the advancement in occurring time of C. suppressalis in recent years. The larvae of C. suppressalis experience favorable environmental conditions for overwintering in Miscanthus fields. The results of this study provide important inputs for the development of environment-friendly control methods.

• Nak Jung Choi(Crop Foundation Reseatch Division, National Institute of Crop Science)
• Man Young Choi(Crop Foundation Reseatch Division, National Institute of Crop Science)
• Bong-Choon Lee(Crop Foundation Reseatch Division, National Institute of Crop Science)
• Sang-Min Kim(Crop Foundation Reseatch Division, National Institute of Crop Science)
• Ji-Eun Ra(Crop Foundation Reseatch Division, National Institute of Crop Science)