Abstract
ABSTRACT The efficacy of nine plant species belonging to seven families have been evaluated in the form of aqueous extracts for their insecticidal, anti-ovipositional and ovicidal properties against the pulse beetle, Callosobruchus maculatus F., infesting cow pea, Vigna unguiculata (L.) Walp. Small gunny bags were treated with a 10% concentration of each extract. Cowpea seeds (50g) were stored in the treated bags and two pairs of neonate adults of C. maculatus were introduced into plastic containers containing the treated bags. Cowpeas protected with the aqueous extracts of Coleus aromaticus Berth., Morinda tinctoria Buch-Ham., and Cassia siamea Lam. were found to be effective in reducing egg laying, adult emergence and percent reduction in weight loss. Among the ten plant extracts screened, Crateva adansonii DC (Buch-Ham) M. Jacobs., and Abrus precatorius L., were not effective against these beetles during the post harvest storage under laboratory conditions for 60 days.
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