Ojumoola, A.O.Adesiyun, A.A.Usman, L.A2021-09-142021-09-142015Ojumoola, A.O., Adesiyun, A.A & Usman, L.A (2015): Fumigant effect of sweet basil (Ocimumbasilicum L) leaf essential oil on the longevity and fecundity of adult cowpea bruchid Callosobruchus maculatus (F) and on germination. Agrosearch,15 (2): 47-58https://uilspace.unilorin.edu.ng/handle/20.500.12484/6316Fresh pulverised leaves (00g) of Ocimum basilicum (L) were harvested in July 2014. Essential oil yield from the hydro-distilled leaves after 3 hours was 0.3(w/w) %. GC_MS analysis revealed the predominance of oxygenated monoterpenes (41.0%) in the oil. Terpinen-ol was the major oil constituent accounting for 29.8%. The essential oil (EO) vapour was used to generate an insecticidal atmosphere within airtight fumigation chambers (130mL). Each chamber contained 2 pairs of adult C. maculatus and ten seeds of Ife Brown cowpea variety. The EO was tested at 10, 20, 30 and 40 uL/130mL air. After 24 hours of exposure, the control had the lowest percentage mortality (0.00) while complete mortality was observed in both the 30uL and 40ul doses.enEssential oilfumigationOcimum basilicumcallosobruchus maculatushydrodistillationArticle