ANTI-OVIPOSITIONAL, OVICIDAL AND LARVICIDAL EFFECT OF INDIGENOUS PLANT OILS AGAINST PULSE BEETLE

Abstract

The experiment was carried out in the Department of Entomology, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during May to November 2017. Pulse beetle, Callosobruchus chinensis L., is an important pest of stored chickpea and widely distributed. Chemical insecticides and fumigants are common control used against pulse beetle but it has serious drawbacks. As an alternative control method, plant oils have been successfully used against this pest. The efficacy of six plant oils was assessed for their grain protectant against the attack of C. chinensis. All the tested oils were effectively reduced oviposition, adult emergence, seed infestation and weight loss compared to control. Both, kalozira and mustard oils showed best performance to reduce adult emergence, seed infestation and seed weight loss while applied those at the rate of 10% concentration. Both kalozira (95.86%) and mustard (91.05%) oils provided the highest inhibition rate of adult emergence when egg bearing seeds were treated at 10% concentration. Additionally, kalozira (94.47%) and mustard (88.33%) oils also markedly reduced the adult emergence while larva bearing seeds were treated at 10% concentration. Therefore, kalozira and mustard oils would be used for the protection of chickpea seeds from the infestation of C. chinensis.