An experiment was laid out during kharif 2006-07 and 2007-08 to test the bio-efficacy of a new herbal pesticide, proton obtained from Universal Crop Science Ltd, Mumbai. Proton @ 1.50 ml/l recorded significantly lower Helicoverpa armigera (Hubner) larval population during 2006 and 2007 (0.77 and 0.62 larva/plant, respectively) which was on par with proton @ 2.0 ml/l and standard check spinosad 45 SC @ 0.12 ml/l. Similarly, Proton @ 2.00 ml/l recorded significantly lowest fruit damage (6.80%) which was at par with Proton @ 1.50 ml/l (7.22%) during 2006. Proton @ 1.50 ml/l recorded higher green chilli yield (34.38 and 31.68 q/ha during 2006 and 2007, respectively) which was on par with Proton @ 2.00 ml/ and standard check spinosad 45 SC @ 0.12 ml/l (34.92 and 30.28 q/ha during 2006 and 2007, respectively). Proton @ 1.50 ml/l recorded higher net profit of Rs. 36,962/ha and B:C ratio of 3.32, which is next best to spinosad 45 SC @ 0.12 ml/l but superior to nimbecidine 1500 ppm @ 3 ml/l.