Results of field experiment to screen certain adjuvants for improving NPV efficacy in the control of Helicoverpa armigera (Hbn.) on sunflower and pigeonpea revealed that application of NPV® 500 LE/ha + boric acid 0.1% or NPV + jaggery 0.5% significantly reduced larval population over the application of NPV alone. The above combinations also gave reduced head damage in sunflower, pod and seed damage in pigeonpea and also increased yield