Response of chemical insecticides against cotton aphid and whiteflies by using stem smearing technique

Abstract

This investigation was conducted at Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola during 2014-15 to evaluate the effect of newer insecticides through stem smearing on aphids and whiteflies of cotton. The experimental material consist of insecticides viz. imidacloprid 48 FS, acephate 50 + imidacloprid 1.8 SP, clothianidin 50 WDG used for stem smearing at three different concentrationof 1:5, 1:10 and 1:20 applied at 20 and 40 days after emergence with the help of stem smearing bottle and imidacloprid 70 WS used as seed treatments @ 10g/kg. Amongst the treatments tested stem smearing of imidacloprid 48 FS @ 1:5 dilution applied at 20 and 40 days after emergence was found most promising against managements of aphids and whiteflies population, followed by stem smearing with imidacloprids 48 FS @ 1:10 and acephate 50 + imidacloprid 1:8 SP@ 1:5 dilution.