Relative efficacy of different insecticides against whitefly, Bemisia tabaci on tomato under field condition

A field trial was conducted at Vegetable Research Farm of Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur), Bihar during Rabi season of 2016-17 on a tomato crop variety Avinash 2 to evaluate the efficacy of different insecticidal treatments against whitefly, Bemisia tabaci. Three sprays at ten days interval of ten treatments with three replications were applied in the field. The treatment were profenophos @ 500 g a.i. ha-1, imidacloprid @ 20 g a.i. ha-1, cypermethrin @ 25 g a.i. ha-1, indoxacarb @ 50 g a.i. ha-1, profenophos 40% + cypermethrin 4% @ 440 g a.i. ha-1, neem seed kernel extract 5%, neem oil 2%. tobacco decoction 5%, yam bean seed extract 5% and control (water spray). The data (population of whitefly) were recorded one day before first spraying and first, fifth and seventh day of each spray. The data revealed that after each spray all the insecticidal treatments were significantly superior over control in reducing whitefly population and efficacy was maximum in imidacloprid followed by profenophos 40% + cypermethrin 4% and it was minimum in tobacco decoction while efficacy of other insecticides were in between these insecticides.