author(s)
Bhavna Verma, Mahendra Bele, Sunil Silavat, RK Choudhary and SB Singh

abstract
The experiment entitled Alternation of insecticide sprays for the management of thrips (Thrips tabaci) and whitefly (Bemisia tabaci) and foliage losses caused by sucking pests of Bt cotton in malwa region of Madhya Pradeshconducted during kharif 2014-2015 in the Department of Entomology, at College of Agriculture, Indore (M.P.) under All India Coordinated Cotton Improvement Project, In randomized block design. The population reduction of thrips was found maximum in T5- Spiromesifen (22.9%SC) @ 144 gai/ha & Deltamethrin (2.8%EC) @ 15 gai/ha (77.78%) and treatment T5- Spiromesifen (22.9%SC) @ 144 gai/ha & Deltamethrin (2.8%EC) @ 15 gai/ha was found effective in reducing the whitefly population (78.00%) received maximum net return (Rs.121313) with maximum cost benefit ratio (1:2:81) at par with T6- Fipronil (5%SC) @ 100 gai/ha & Lambdacyhalothrin (4.9%EC) @ 15 gai/ha. In which (3105kg/ha) yield was recorded and second highest net return (112092) and cost benefit ratio (1:2.60) was noticed.