Pesticidal potential of some selected tropical plant extracts agains Callosobruchus maculates (F) and Callosobruchus chinensis (L) (Coleoptera: Bruchidae)

RHS Rajapakse, D Ratnasekera

Abstract

Plant oils obtained from leaves and other parts of 20 different plant species were bioassayed under laboratory conditions for their ability to protect stored legumes from damage by cowpea weevil (Callosobruchus maculatus) and adzuki bean seed weevil (Callosobruchus chinensis). Three plant oil extracts showed some bioactivity, nine plant oil extracts caused significant adult mortality in both spe-cies and eight had none. Six plant oil extracts, black pepper, lemon grass, clove seeds, neem, custard apple, and sacred basil inflicted between 41 to 100% egg mortality in both species in the order of 60, 60-67, 70, 90, 91 and 100% respectively.

DOI: 10.4038/tare.v11i0.1793

Tropical Agricultural Research and Extension Vol.11 2008 pp.69-71

Keywords

Callosobruchus maculatus; Callosobruchus chinensis; pesticides
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