Screening of some medicinal plant extracts for toxic and repellent potential against adult stage of rust red flour beetle, Tribolium castaneum (Herbst) (Coleoptera Tenebrionidae)

摘要

Plant based insecticides are effective control agents against the stored grain insect pests especially for Tribolium castaneum(Herbst) (Coleoptera: Tenebrionidae). Due to the problems related with the indiscriminate use of artificially made insecticides like insect resistance and effect on non-target organisms, many scientists in whole have focused on the search for active naturally occurring essential plant products. 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 andTeminalia chebula were evaluated at a rate of 5, 10 and 15 % concentrations against the Tribolium castaneu. Extract of Trachspermum ammi gave maximum mean repellency (83.70%) at 15% while minimum repellency was observed in case of Teminalia chebula at 15% concentration. Maximum mortality was 16.11% in case of A. indicaat 15% concentration while minimum (2.78%) was observed against T. chebulaat 5%