Abstract
Laboratory evaluation of the efficacy of three pesticidal plants: Senna alata Linnaeus., Hura crepitans Linnaeus., and Calophyllum inophyllum Linnaeus for the protection of Cola nitida (Schott & Endl.) against cola weevil (Balanogastris kolae Desbr.) was carried out in the Department of Forestry and Wildlife Resources Management, University of Calabar. Adult mortality in treated kolanuts at various concentrations was significantly (P < 0.05) higher compared with the untreated (0.00 %). The selected plants at various concentrations recorded a significant (P < 0.05) lower adult emergence from week five to nine compared with the untreated (12.33 ± 1.20, 20.67 ± 3.18, 31.67 ± 2.96, 38.00 ± 0.58, and 40.33 ± 0.88). However, in weight loss, all the extracts (paste) from week three to nine caused significantly (P < 0.05) low weight loss compared to the untreated. Storage of kolanut with 1.5 g of the selected plants, especially with C. inophyllum was found adequate, considering their general protective effectiveness on the kolanuts. The tested extracts therefore could be used as alternative to synthetic insecticides by resource poor farmers, so as to reduce their total dependence on synthetic insecticides for kolanut storage.
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