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Article history Received: 22 June 2020 Accepted: 9 July 2020 Published Online: 17 July 2020 Tribolium castaneum is a species of beetle in the family tenebrionidae, the darkling beetle. Conventional insecticides used for controling stored product pests are expensive and are proven to have side effects hence the need to have an alternative biopesticides from plants which are proven to be effective against many insects. Azadrachta indica has been used for the control many insects, literature review show no report of its effects on Tribolium castaneum. This study is aimed at evaluating the bioinsecticidal activity of ethanolic leaves extract of Azadirachta indica against stored Tribolium castaneum. Different concentrations (60, 70, 80, 90, and 100%) of ethanolic leaves extract of A. indica was applied on the filter paper and were allowed to dry. Control was done by applying water only on the filter paper. For the determination of the percentage mortality, 15 adults of the insects was taken into the Petri dishes embedded with the filter paper covered with a lid. The A. indica extracts at different concentrations tested showed significant insecticidal activity against T. castaneum. Secondary metabolites screening indicated that the A. indica extract have secondary metabolites that are related to insecticidal activity. The study has shown that the ethanolic leaves extract A. indica is effective in managing stored product pest.

Bioefficacy of Ethanolic Leaves Extract of Azadirachta indica Against Stored Product Insect Pest, Tribolium castaneum (Herbst.)