The diamondback moth, Plutella xylostella (DBM) is a major pest of cruciferous vegetables. The insecticide resistance of this pest is very serious and has been reported in more than 600 cases. It is important to evaluate insecticide response to manage the resistant populations In this study, we investigated the insecticide susceptibility of local DBM strains collected from five major cabbage cultivation area in Korea to the ten commercial insecticides with leaf dipping method . As a result, the resistance ratio(R/R) of almost all the tested pesticides was 0.1∼3.3 (low resistant) and there was no differce within local regions. But dinotefuran showed middle resistance with regional differences (R/R , 5.9∼69.4) For the estimate the control effectiveness, we calculated the log value of the recommendation concentration divided by LC90 of pesticides. The result showed that the efficiency of neonicotinoids was generally low and that of emamectin benzoat every high. In conclusion, neonicotinoids was to use carefully and emamectin benzoate was very good alternative in DBM control in Korea

• In Hong Jeong(National Institute of Agricultural Sciences, Wanju, Jeonbuk 55365, Korea)
• Sang Gu Lee(National Institute of Agricultural Sciences, Wanju, Jeonbuk 55365, Korea)
• Si Hyeock Lee(Department of Agricultural Biotechnology, Seoul National University, Seoul 08826, Korea)
• Deok Ho Kwon(Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea)