Resistance to γ-BHC in the brown planthopper, Nilaparvata lugens

Abstract

Susceptibility of the brown planthopper to γ-BHC, collected from several areas of Kyushu district in 1967-8, was investigated by topical application method.
The hoppers collected at a point of Saga prefecture, where difficulties in field control with BHC dusts were reported in 1967, showed the highest tolerance to γ-BHC among planthoppers tested, suggesting that control failures were mainly attributable to the development of resistance.
Laboratory selection by topical dosing with γ-BHC increased the resistance 7 times in 5 generations, but cross resistance to DDT, carbaryl and fenitrothion was not observed. The LD₅₀ of the selected strain to γ-BHC was approximately 20-fold higher than that of the most susceptible field strain.