The present study was conducted to evaluate the insecticidal property of Ocimum basilicum (L.) against cigarette beetle, Lasioderma serricorne (Fab.). The bioactive compounds from the leaves were extracted using Soxhlet apparatus with methanol. Five different concentrations viz., 1%, 2%, 3%, 4%, 5% were used against adult beetles of L. serricorne. In contact toxicity, highest mean mortality was effected by 5% methanol extract (66.67%), followed by 4% methanol extract (58.33%), 3% methanol extract (52.22%), 2% methanol extract (47.22%) and 1% methanol extract (43.33%). In repellency test, 5% methanol extract produced highest mean repellency (86.88%) (Class V) followed by 4% methanol extract (80.00%) (Class V), 3% methanol extract (73.75%) (Class IV), 2% methanol extract (68.13%) (Class IV) and 1% methanol extract (64.38%) (Class IV). Introduction Cigarette beetle, Lasioderma serricorne Fab. (Coleoptera: Anobiidae) occurs all over the world from tropics to sub-tropics . They are also called as tobacco beetle, since their main host is tobacco. They also infest a wide range of products like turmeric, seed spices, paprika seeds, onion seeds, sesame seeds, wheat flour, corn flour, dried yeast, biscuits, milk powder, dried flowers, processed cereal products and even materials like books, museum specimens, dead insects, fish meal, animal meal etc., The annual loss caused by L. serricorne on stored spices at normal unprotected condition is 58.02 per cent on fennel, 49.58 per cent on coriander, 47.75 per cent on ajowan, 51.02 per cent on cumin and 39.0 per cent on dill . Synthetic pesticides and fumigation are commonly used to control this notorious pest in godowns and ware houses. Excessive use of fumigants like methyl bromide, carbonyl sulphide and aluminium phosphide has lead to development of insecticide resistance, disruption of natural enemies, high mammalian toxicity, etc., Hence, it is necessary to discover an ecofriendly management strategies to reduce the usage of chemical pesticides. Sweet basil, O. basilicum (L.) is an herbaceous perennial plant which belongs to the family Lamiaceae. They are distributed generally in tropical areas of Asia, Africa, Central and South America and cultivated in India over an area of 25,000 ha. The O. basilicum plant has been reported to show insecticidal properties against Sitophilus oryzae, Lasioderma serricorne, Acanthoscelides obtectus, Tribolium castaneum, etc., [12, 9, 16]. Compounds like linalool, estragole, 1,8-cineloe, α-pinene, β-pinene, farnesene, germacrene, hexadecenoic acid, menthol pulegone, ocimene, D-camphor etc., were identified in O. basilicum which may be the inherent character for its toxic nature to insects [2, 11]. Moreover, these plant derived compounds are biodegradable, have low mammalian toxicity, are selective in action and also delay the development of pesticide resistance in insects. The present study reveals the insecticidal activity of O. basilicum against L. serricorne.