Abstract
ABSTRACT The insecticidal activity of Piper guineense Schum & Thonn extracts mixed with extracts of other plant species was tested on Maruca vitrata Fab. (Lepidoptera: Pyralidae) and the coried bug, Clavigralla tomentosicollis Stal. (Hemiptera: Coreidae), two major post-flowering cowpea [Vigna vitrata (L.) Walp.] pests. Extracts of Piper guineense mixed with extracts of Allium sativum L., Azadirachta indica A. Juss, and Xylopia aethiopica (Dunal) A. Rich provided effective pest control, leading to significant reductions in the population of the test pests as compared with untreated controls. In 2 years of study, the extract mixtures also resulted in significant reduction of pod damage on the cowpea and grain yields comparable with plants treated with a synthetic insecticide. The observations demonstrate the potential use of P. guineense in mixtures with other plants for protecting field cow-pea against M. vitrata and C. tomentosicollis.
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