Effect of insecticides on the feeding and fecundity of rice brown planthopper, Nilaparvata lugens (Stål)

Abstract

Stimulatory effect of some insecticides on feeding and reproductive rate of rice brown planthopper Nilaparvata lugens (Stål) was investigated in the laboratory experiment during kharif 2020 and rabi, 2020-21 at RARS, Maruteru, Andhra Pradesh. Brown planthopper excreted significantly higher amount of honeydew on deltamethrin (278.67mm2 ) and fipronil (231.17mm2 ) treated rice plants. Deltamethrin also resulted in enhancement of reproductive rate of BPH and consequently resulted in resurgence (resurgence ratio>1), whereas the remaining insecticides i.e., flubendiamide, chlorantraniliprole (foliar and granular), fipronil, carbofuran and cartap hydrochloride did not influence the reproductive rate of BPH (resurgence ratio<1). Hence, insecticides barring deltamethrin can be used judiciously against insect pests of rice with periodical monitoring for development of resistance and induction of resurgence. ><1). Hence, insecticides barring deltamethrin can be used judiciously against insect pests of rice with periodical monitoring for development of resistance and induction of resurgence.