Legume crops are important nutritionally, economically and ecologically. Aphids are causing a serious economic damage to these important crops worldwide. What is the role of botanical pesticides in pest management? Why botanical pesticides are advocated in organic food production over conventional pesticides? The investigation of contact toxicity and settling deterrence of crude extracts of birbira, Millettia ferruginea, seeds powder in solvents of different polarity against pea aphid (Achrythosiphon pisum) explains the above questions and briefs more. Specialists and postgraduates in entomology, pest management, biopesticides and environmentalists will find the material interesting and useful. It also recommends further research work to be benefited from botanical pesticides.