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Brinjal Solanum melongena L. is an herbaceous, tropical perennial plant, belongs to the family Solanaceae which is grown for its edible fruit. Among the different major insect pests infesting brinjal, whitefly, Bemicia tabaci (Genn.), is very important under West Bengal condition. The experiment was conducted during the 2013 and 2014 in the University farm at Kalyani, West Bengal state of India. Cv ‘Muktakeshi’ was grown in plots measuring 5 m×5 m, at spacing of 1 m x 0.75 m with three replication. The plots were set out in a randomized block design with six treatments including an untreated check. Five doses of cyazypyr 20% SC (4.5 MAT ,6.0 MAT, 7.5 MAT, 9.0 MAT and, 12 MAT in both year 2013 and 2014) were sprayed every year for their efficacy, After 50 days of treatment cyazypyr 20% SC @ 9.0 and 7.5 MAT (3.33 and 6.87 whiteflies / 5 leaves, respectively) maintained their superiority in controlling whiteflies, while @ 6.0 and 4.5 MAT (7.93 and 8.40 whiteflies / 5 leaves, respectively) and this treatment failed to show any significant difference from untreated control.