Effectiveness of Oils in Protecting Stored Cowpeas from the Cowpea Weevil (Coleoptera: Bruchidae)

Document Type

Article

Journal/Book Title/Conference

Journal of Economic Entomology

Volume

76

Publication Date

1-1-1983

First Page

634

Last Page

636

Abstract

Applications of five chemically differing oils (three vegetable oils, mineral oil, and polyethylene glycol) at dosages of 5.0 ml of oil per kg of seed effectively protected cowpeas, Vigna unguiculata, from Callosobruchus maculates (F.). Oils caused high mortality of eggs and larvae on the seed surface, but had no effect on individuals that successfully entered the seed. A lack of oil-specific activity indicated that the protective property was physical rather than chemical. After 30 days in storage, treated seeds were more deterrent to ovipositing females than were newly treated seeds, but the stored seeds were less toxic to eggs and larvae. Oil application may therefore be useful for only a limited period of time.

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