Evaluation of the efficacy of some insecticides against rice yellow stem borer, Scirpophaga incertulas (Walker)

The present investigation entitled Evaluation of the efficacy of some insecticides against rice yellow stem borer, Scirpophaga incertulas (Walker) was undertaken at MAE Farm, Regional Agriculture Research Station, Karjat (M.S.) during Kharif 2018. The overall mean yellow stem borer infestation (dead heart) varied from 1.23 – 7.50 per cent. The T5 (Flubendiamide 20 WG @ 0.005%) recorded minimum (1.23%) infestation of yellow stem borer and which was significantly superior over all remaining treatments. The next effective treatments were T7 (Chlorantraniliprole 18.5 SC @ 0.006%) and T3 (Emamectin benzoate 5 SG @ 0.0015%) which recorded 1.75 and 1.94 per cent infestation, respectively. The T4 (Thiodicarb 75 WP @ 0.113%) recorded 2.26 per cent infestation and was at par with T1 (Cartap hydrochloride 75 SG @ 0.090%) 2.32 per cent infestation. Other treatments with descending order of effectiveness were T6 (Fipronil 5 SC @ 0.01 5) 2.59 per cent infestation and T2 (Lambda cyhalothrin 5 EC @ 0.003%) 2.84 per cent infestation. The maximum infestation 7.50 per cent dead heart was recorded in T8 (untreated control).