Abstract:Continuous monitoring of the field population susceptibility to insecticides is an important measure to control Cnaphalocrocis medinalis.The present study aimed to detect the susceptibility of the C. medinalis field populations to common insecticides in Hubei,Hunan,Jiangxi,Anhui and Henan provinces.Leafdipping method was used to detect the susceptibility of the C. medinalis field population to seven insecticides in Chibi,Wuxue,Wuhan,Xiaogan,Huanggan,Changsha,Nanchang,Pingxiang,Hefei and Xinyang during 2015-2019.In addition,cluster and regression analysis were performed on the detected data.The results showed that:(1)The toxicities among seven insecticides were significant different，with an order of fluorobenzamide ≥ abamectin ≥ spinetoram > chlorantraniliprole ≥ indoxacarb > cyantraniliprole > chlorpyrifos.(2)No significant difference of the susceptibility was detected among different populations of C.medinalis.(3)There were significant differences between the years.Significant changes of sensitivity in different years were found among some populations to chlorpyrifos,chlorantraniliprole,indoxacarb and cyantraniliprole.For example,the susceptibility of Chibi and Changsha populations of C. medinalis to chlorpyrifos decreased by 2.3-4.1 times from 2015 to 2016，and that of Chibi，Xiaogan and Changsha populations increased 2.1-4.9 times from 2016 to 2019，the susceptibility of Chibi,Wuxue and Xiaogan populations to chlorantraniliprole decreased 2.6-7.3 times from 2015 to 2019， the susceptibility of Wuxue population to indoxacarb decreased by 4.2-4.7 times from 2015 to 2018，and the susceptibility of Wuxue and Changsha population to cyantraniliprole decreased by 2.2-6.7 times from 2015 to 2018.The above results indicated that the susceptibilities of the C. medinalis field populations to chlorantraniliprole and other insecticides in central China are decreasing significantly,so that the resistance management for these insecticides is very important currently.Abamectin,spinetoram and cyantraniliprole are preferentially recommended for the control of C. medinalis,under a rotation manner.