Temporal variability and resistance correlation of sulfoxaflor susceptibility among. Chinese populations of the brown planthopper Nilaparvata lugens (Stal)

The brown planthopper (BPH) is an important pest of rice crops throughout Asia, and this pest has developed high resistance to many groups of insecticides following their heavy and frequent application. Sulfoxaflor is a new insecticide that was registered in China in 2013 to control the brown planthopper in paddy fields. In the present study, the susceptibilities of forty-four field populations of N. lugens from nine provinces of China from 2013 to 2016 to sulfoxafior and nine other frequently used insecticides were assayed by using the rice-seedling dip method. The results showed that the LC50 values of field populations of N. lugens to sulfoxafior varied from 1.63 to 13.20 mg a. I./L, revealing that N. lugens has developed a low level of resistance (resistance ratio, RR = 0.8-6.8-fold) to sulfoxafior. The susceptibility of field populations of N. lugens to sulfoxafior was significantly correlated with the responses of N. lugens to all neonicotinoid insecticides tested and to buprofezin. This study reveals the current resistance levels of N. lugens to sulfoxaflor in China and implies a potential cross resistance pattern which need to be taken into account in the rational use of this new insecticide in insecticide resistance management programs. (C) 2017 Elsevier Ltd. All rights reserved.