In the present study, combinatorial action of essential oils towards a serious insect pest of pulses, Callosobruchus chinensis has been investigated. Essential oils were isolated from dried fruits of Trachyspermum ammi, Anethum graveolens and Nigella sativa by hydrodistillation and its insecticidal and oviposition inhibitory activities were determined by fumigating adults of the C. chinensis with different balanced combinations of essential oils. Mortality in adults was observed in concentration dependent manner when fumigated with different combinations of different essential oil combinations. The 24-h LC50 (Median lethal concentration) values for combinations of T. ammi and A. graveolens; A. graveolens and N. sativa and N. sativa and T. ammi and essential oils were 11.6, 8.7 and 11.2 μL, respectively. Fumigation with sublethal concentrations of T. ammi A. graveolens; A. graveolens and N. sativa and N. sativa and T. ammi essential oil combinations significantly reduced the oviposition potential of the C. chinensis in comparison to the control group. From the results of the present study, it can be concluded that combinations of essential oils shows synergism and give desired toxicity even at lower concentration than used alone.