Bioefficacy of insecticides and botanicals against cabbage butterfly, Pieris brassicae

Abstract

In order to determine the selected botanicals, bio-pesticides and synthetic pyrithroids viz., Cow urine + Azadiracta indica, Cow urine + Eupatorium adenophorum, Cow urine + Lantana camara, Cow urine + Melia azedarach, Bacillus Thuringiensis var. Kurstaki, Beaveria bassiana,Spinosad 45% SC, Emamectin Benzoat5% SG, Deltamethrin 2.8% EC, respectively, against Cabbage butterfly P. brasssicae. The Field trial was conducted during Rabi season 2017-18 at Bharsar, Pauri. The insecticides were used as per recommended dose along with an untreated control. Each insecticide was sprayed twice at 14 days interval. The larval count per plant was taken one day before and 3, 7, 11 and 14 days after each spray. All the insecticides tested significantly reduced the pest population compared to control. Spinosad 45% SC 3ml/lit was the most effective on the basis of pest population per plant and increased the yield over untreated control. The maximum yield per ha was recorded in Spinosad 45% SC (214.87q/ha) followed by Emamectin benzoate 5% SG (203.08q/ha), Deltamethrin 2.8% EC (200.66q/ha), Bacillus thuringiensis var. kurstaki (195.95q/ha), Beaveria bassiana (187.92q/ha), Cow urine+Azadiracta indica (172.21q/ha), Cow urine + Eupatorium adenophorum (167.55q/ha) and Cow urine +Lantana camara (160.45q/ha). The minimum yield per ha recorded in control (145.07q/ha).