Laboratory experimentations were conducted for the evaluation of contact and repellent activities of acetone based plant extracts of Allium sativum (Garlic), Azadirachta indica (Neem), Citrus limon (Lemon) and Eucalyptus globules (Safaida) against the insect pest of stored grain commodities, Tribolium castaneum.Various concentrations (5, 10 and 15%) of the plant extracts were applied on the filter papers in the bioassay experiments and after the release of 15d old beetles, mortality was evaluated after fixed intervals (24, 48, 72, 96, 120, 144 and 168h). Repellent action was also checked using the area preference method and preference of adult beetles were checked after fixed period (24, 48 and 72h). Contact toxicity experiments revealed that E. globules (9.41%) proved to be more effective followed by A. sativum (9.20%), C. limon (8.39%) and A. indica (7.48%).Repellent action confirmed E. globule (76.29%) to be more potent and A. indica (63.08%), A. sativum (59.62%) and C. limon (50.12%) were least effective, respectively. Results reflected a positive potential of plant extracts as suitable substitute of conventional synthetic insecticides for the management of insect pest attacking stored commodities.
Plant based insecticides are effective control agents against the stored grain insect pests especially for Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae). The red flour beetle, Tribolium castaneum (Herbst) is one of the severe pests of stored grain commodities The botanicals are have no toxic effects on our surrounding but the bioactivities of these plant extracts may induce certain detrimental effects on the biology of the certain insects causing infestation in stored grains The toxic and growth disruptive effects extracts from five medicinal plants viz; Azadirachta indica, Murraya exotica, Eucalyptus comeldulensis, Trachspermum ammi and Teminalia chebula were evaluated at a rate of 5, 10 and 15 % concentrations against the Tribolium castaneum. Highest larval inhibition was observed in case of E. comeldulensis (72.32%), followed by A. indica (63.96%), T. ammi (62.90%), M. exotica (58.93%) and T. chebula (54.96%). Maximum pupal inhibition was observed in case of E. comeldulensis (70.21%), followed by A. indica (62.26%), M. exotica (55.19%), T. ammi and T. chebula were both equally effective (54.82%). Highest adults' inhibition was observed in case of E. comeldulensis (66.67%), followed by A. indica (58.82%), M. exotica (54.90%), T. ammi (52.08%) and T. chebula (50.00%). These experiments will lead to the development of effective and natural growth regulators for control of insect pests attacking stored commodities.
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