Efficacy of new generation insecticides against whitefly, Trialeurodes ricini (Genn) and thrips, Retithrips syriacus (Mayet) on castor

Abstract

Field experiment was conducted at Agricultural College and Research Institute, Vazhavachanur, Tamil Nadu to to study the efficacy of new generation insecticides viz., Clothianidin 50 WDG @ 0.1 g/l, Flonicamide 50 WG @ 0.2 g/l, Acetamiprid 20 SP @ 0.2 g/l, Thiomethaxam 25WG @ 0.4 g/l, Imidacloprid 17.8 SL @ 0.5 ml/l, Buprofezin 25 SC @ 0.8 ml/l, Diafenthiuron 50 WP @ 0.8 g/l and conventional insecticides Profenophos 50 EC @ 2ml/l and Dimethoate 30 EC @ 1.7 ml/l along with untreated control against thrips and whitefly in castor. The pooled mean of Buprofezin 25 SC i.e, 4.46 whitefly per plant was noticed after the treatment, which was followed by Profenophos 50 EC, where 8.75 whiteflies were noticed against 57.43 in untreated control in whitefly. The percent reduction over control of thrips population was observed in Buprofezin 25 SC @ 0.8 ml/litre of water (73) followed by Clothianidin 50 WDG @ 0.1 g/litre of water (70) and Dimethoate 30 EC @ 1.7 ml/litre of water (60) in thrips. The highest yield was recorded in Buprofezin 25 SC @ 0.8 ml/litre of water (1821 kg/ha) followed by Imidacloprid 17.8 SL @ 0.5 ml/ litre of water (1626 kg/ha) against 893 kg/ha in untreated control.