Received: 22nd Feb 2019; Accepted: 25th April 2019

Abstract

In order to find the efficacy of newer insecticides against rice yellow stem borer, Scirpophaga incertulas (Walker) and leaf folder, Cnaphalocrocis medinalis (Guenée). Field experiments were conducted during Kharif and Rabi seasons during 2015-16 at Regional Agricultural Research Station, Pattambi using the Jyothi rice variety. The insecticide molecules tested were DPX-RAB 55@ 237.5ml/ha, flubendiamide + thiacloprid 240SC @ 250 ml/ha, flubendiamide 480SC @ 50 ml/ha, thiacloprid 480 SC @ 250 ml/ha, chlorantraniliprole 18.5% SC @ 150 ml/ha with dinotefuran 20% SG @ 200 g/ha as check insecticide and an untreated control. The pooled results of two crop seasons revealed that chlorantraniliprole 18.5 % SC, flubendiamide 480 SC and flubendiamide + thiacloprid 240 SC were found superior against stem borer (dead hearts and white ears) and leaf folder with significantly lower per cent of leaf damage. Significantly higher grain yield was obtained from chlorantraniliprole 18.5 SC (4196 kg/ha) followed by flubendiamide 480 SC (3885 kg/ha) and flubendiamide + thiacloprid 240 SC (3321 kg/ha) treated plots.