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Journal of Entomology

Year: 2006 | Volume: 3 | Issue: 1 | Page No.: 70-75
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Authors

Oparaeke Alphonsus Mbonu

Keywords

Research Article

Effect of Aqueous Extracts of Tropical Plants for Management of Maruca vitrata Fab. and Clavigralla tomentosicollis Stal. on Cowpea, Vigna unguiculata (L.) Walp. Plants

Oparaeke Alphonsus Mbonu
The present study aimed at increasing the data bank of botanical pesticides evaluates the effect of crude aqueous extracts of some tropical plants for their insecticidal properties under field conditions for the control of two major post-flowering insect pests of cowpea. The extracts were applied at 10 % (w/v) with four weekly spraying intervals and compared with a synthetic insecticide and an untreated check. The results showed that the extracts of neem, Azadirachta indica (A. Juss), bread fruit, Artocarpus altilis Park and fermented cassava tuber, Manihot esculentus Crantz (in that order) caused significant (p<0.05) reduction of both Maruca vitrata Fab. and Clavigralla tomentosicollis Stal. on cowpea plants compared with other plant extract treatments and were equi-toxic with the synthetic insecticide treatment in the control of both pests in the two years of trials. Pod damage was considerably reduced (< 35%) with consequent increases in grain yields on seed extracts of neem and breadfruit treated plots compared with the other plant extract treatments but were inferior to the synthetic insecticide treatment on the yield parameters tested. Seed quality followed similar trend and was significantly higher in neem seed extract treated plots (79.97%), followed by breadfruit extract (72.3%) and fermented cassava tuber extract (61.97%) among other plant extract treatments.
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