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Articles by Alphonsus Mbonu
Total Records ( 2 ) for Alphonsus Mbonu
  Oparaeke and Alphonsus Mbonu
  The efficacy of different rates (5, 10 and 20% w/v) and application schedules (2, 4 and 6 weekly spraying) of Syzigium aromaticum (L.) Merr and Perr extracts was investigated in two years field trials for the control of the legume pod borer, Maruca vitrata Fab. and the coreid bug, Clavigralla tomentosicollis Stal. on cowpea plants. The different concentrations and spraying schedules of aqueous extracts of clove, S. aromaticum exhibited considerable reduction on the populations of M. vitrata and C. tomentosicollis as compared to the untreated check. Of the clove extract treatments tested, 10 and 20% rates with four and six weekly applications were superior to 5% rate at all weekly schedules. Pod damage was equally reduced and there was a substantial increase in grain yield at higher concentrations and more frequent sprayings but their values were inferior to the synthetic insecticide treatment. Clove extract could form an integral part of a new approach to pest control on arable crops in small farm holdings commonly found in limited resource farmers` enterprises in Africa.
  Oparaeke and Alphonsus Mbonu
  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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