author(s)
Mahantesh Kapasi, Bheemanna M, Guruprasad GS and Vijaykumar Ghante

abstract
Baseline susceptibility of sulfoxaflor 24 SC insecticide was investigated by collecting field populations of brown planthopper from different locations of northeastern Karnataka during 2014-15 and 2015-16. All the selected populations differed in their susceptibility to sulfoxaflor. In general, Gangavati and Sindhanur BPH population recorded higher LC₅₀ values of 29.95 and 27.75 ppm respectively, followed by Ballari (26.16 ppm), Manvi (25.03 ppm) and Devadurga (22.68 ppm). Lowest LC₅₀ value was observed in population collected from Kembhavi (21.56 ppm) during 2014-15. The similar trend was noticed during 2015-16 season. The comparison studies were made with dinotefuran 20 SG and buprofezin 25 SC insecticides for a population collected from Gangavati.