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Journal of Plant Sciences
Year: 2006  |  Volume: 1  |  Issue: 2  |  Page No.: 119 - 125

Pesticidal Activity of Three Rates and Spraying Frequencies of Extracts of Xylopia aethiopica (Dunal) A. Rich for Reducing Thrips Infestation on Cowpea Flowers

Oparaeke and Alphonsus Mbonu    

Abstract: Extracts of Xylopia aethiopica (Dunal) A. Richard were assayed at different dosages (0, 5, 10 and 20% w/v) and weekly application schedules (0, 2, 4 and 6) to control flower thrips, Megalurothrips sjostedti Trybom on cowpea flowers. The extracts were compared with a synthetic insecticide check in two years of field study under rain-fed conditions. The results indicated that thrips population on cowpea flowers was significantly reduced (p<0.05) while pod density was also enhanced (p<0.05) on plots treated at 20% extract rate with 6 or 4 weekly application intervals. The values in the two parameters tested were inferior to the synthetic insecticide check but superior to the untreated check in both periods. X. aethiopica contains Annonaceine, which acts in similar way as morphine and this sedative mode of activity could play an important role in the quest to control pests on crops using this plant extract either singly or in mixtures with other potential insecticidal plants. The pods are readily available, easily bio-degradable, low cost and environmentally friendly while the technology for processing and application of the extract is simple for use by limited resource farmers in third world countries.

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