Hafeez U. Rehman, Said M. Khan


Pulse beetle, Callosobruchus chinensis L. (Coleoptera: Bruchidae) is a destructive pest of stored chickpea. Laboratory experiments were conducted to find out growth inhibition and toxic effect of aqueous extracts of bakain seed (Melia azedarach L.) for the management of C. chinensis during storage. Five different concentrations of the extract, viz. 2.5, 2.0, 1.5, 1.0 and 0.5% were mixed with chickpea grains. Results revealed that bakain seed extract significantly reduced oviposition, suppressed adults’ emergence, reduced infestation by the pest and decreased weight loss of chickpea grains. The tested concentrations of the extract had no significant effect on adult life span of pulse beetle. Bakain seed extract also showed some degree of toxicity against the pest.  Its effectiveness was dose and time dependent. It caused maximum mortality of the pest at the concentration of 2.5 and 2.0% after 72 hours of release of beetles in treated chickpea grains. On the basis of results obtained, it was concluded that aqueous extract of bakain seed could be used effectively for the management of pulse beetle during storage.


Pulse beetle, aqueous extracts, Melia azedarach, growth inhibition, toxicity

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