Field experiments were conducted to study the bioefficacy of some biopesticides viz., Beauveria bassiana (10 g l-1), Pseudomonas fluorescens @ (10 g l-1), Spinosad (45 SC @ 1ml l-1), Fish Oil Rosin Soap (FORS) (@ 25 ml l-1) against papaya mealybug, Paracoccus marginatus in brinjal. Among the biopesticides tested P. fluorescens recorded the lowest mean of mealybug population over control on first (22.3/3 leaves) and second (16.83/3 leaves) spraying. P. fluorescens treatment gave significantly higher yield (26.15 t ha-1) than B. bassiana (25.95 t ha-1) as against untreated check (20.5 t ha-1). The highest cost: benefit ratio was recorded in the same treatment (1: 6.15) with a net income of Rs. 218965 /-.