What is the remedy in order to feed the worlds projected population in 2050 - some nine billion people, up from 7 billion today? How grain legumes are significant nutritionally, economically and ecologically? Why biopesticide are preferred to conventional pesticides? The investigation of the efficacy of Parthenium hysterophorus powder against Callosobruchus chinensis on Chickpea solves the above mentioned questions and briefs more. It also recommends further research works to get benefited from biopesticide.