Bioefficacy of certain chemical insecticides against rice yellow stem borer (Scirpophaga incertulas Wlk.)

Rice is the major staple food in Jharkhand India and threatened by various biotic abiotic stresses. Among insect pests that imperil rice cultivation Jharkhand, yellow stem borer (Scirpophaga incertulas Wlk.) one of most notorious ones. The present investigation was conducted Kharif 2018 to study bioefficacy certain chemical insecticidal treatments against borers measured terms mean values dead heart (% DH) white ear (%WE). Ten treatments, namely, T1 - Flubendiamide 240 SC + Thiacloprid (combination product) @ 200 ml/ha, T2 250 T3 Imidacloprid 17.8 SL @150 T4 480 50 T5 Rynaxypyr 20 T6 Fipronil 80 WG 65 g/ha, T7 Dinotefuran SG T8 0.3 GR followed Chlorpyriphos EC @2000 T9 EC@ 2000 ml/ha T10 untreated control were taken for experiment. results showed two treatments,namely T2- flubendiamide thiacloprid (2.07% DH 2.30% WE) (1.89% 2.49% WE), at par with each other. They performed better than all other suggesting using these newer could provide all-around protection crop both ear.