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Articles by J. Kayode
Total Records ( 5 ) for J. Kayode
  J. Kayode and J.E. Otoide
  Matured leaves of Newbouldia laevis were randomly collected from polluted and non-polluted habitats in two areas of Edo state. Microscopic examination of their epidermis revealed that the stomatal apertures in leaves from polluted habitats were closed while those from non-polluted habitats were opened. Also, epidermal cell aberrations and erosion were noticed in polluted specimens while the non-polluted specimens had normal tissue arrangements. Leaves from both populations were hypostomatic consisting of anisocytic stomatal type. The frequency of stomata for polluted and non-polluted samples was estimated to be 66.6 and 25.0%, respectively. Furthermore, the polluted population had an average leaf area of 54.98 cm2 while the non-polluted population had 126.36 cm2. It was suggested that foliar morphology of Newbouldia laevis could serve as a Phytometer to gauge the effects of air pollutants on the environment.
  J. Kayode
  The occurrence of Compositae weed species in Cola nitida, Eleais guineensis and Theobroma cacao plantations in Ekiti State, Nigeria was examined. Results obtained revealed that the compositae weeds constituted 73, 89 and 75% of the total number of weeds individuals sampled in the Cola nitida, Eleais guineensis and Theobroma cacao plantations respectively. The germination test conducted on the soil samples obtained from the three plantations also confirmed the dominance of the compositae weeds, in terms of density, in the soil seed bank of the commercial plantations. The percent compositions of compositae in the three plantations were 77, 76 and 77%, respectively.
  O.M. Obembe and J. Kayode
  The test plants species, namely Crotaria retusa, Hyptis suaveolens, Ricinus communis and Tithonia diversifolia were extracted with water. The extracts were evaluated on Callosobruchus maculatus for mortality, oviposition and adult emergence effects. The long-term protectant ability and viability were also investigated. The results showed that the aqueous extracts from T. diversifolia were most effective on C. maculatus, followed by extract from Ricinus communis. The least potent extracts were those extracted from Crotalaria retusa and Hyptis suaveolens. Also, the extracts considerably reduced oviposition by C. maculatus. Extracts from T. diversifolia and R. communis drastically reduced infestation and subsequence damage of the treated cowpea seeds for a period of three months. Most of the treated seeds germinated after 90 days storage period. The results from this study revealed that aqueous extracts from all the four plants species were effective in controlling cowpea bruchid, C. maculatus and could serve as an alternative to synthetic insecticides for protection of stored cowpea seeds against bruchids.
  J. Kayode and T.O. Ogunleye
  A combination of social surveys and direct field observations were carried out to determine the plant species that are used in Kaduna Sate, Nigeria, as spices. A total of 25 plant species are used as spices in the study area. The most widely utilized parts, in terms of the diversity of the botanicals, are the fruits, seeds and flowers while the least utilized part is the rhizome. The methods of extraction in over 50% of spices were predatory and annihilative. Most of the species whose barks were extracted were not cultivated though some were perennials. The relative regrowth capabilities of debarked trees and shrubs in the study area were unknown indicating that these methods might results in increasing scarcity of these species. Though considerable proportion of the botanicals were extracted by non-predatory and gathering methods yet collection of fruits and seeds were observed to be by pulling or cutting of the branches thus making such collection to be destructive. At present most of the spices species are becoming rare. Thus the increasing conversion of valuable natural environment to monoculture plantation of exotic timber and agriculture, might likely lead to the continue erosion of botanical diversity in the study area. Consequently strategies for the conservation of these species were proposed.
  J. Kayode , E.S. Christmas and G.M. Kayode
  A combination of social survey and direct field observation was used to identify and determine the conservation status of botanicals used by the indigenous okpe-speaking people of Delta State, Nigeria during natality periods. While a total of 11 botanicals belonging to 11 different families were found to be widely utilized during the pre-natal periods, another 10 botanicals, belonging to 10 different families were widely utilized during the post-natal periods. Only 7 of these botanicals were cultivated. Among the uncultivated botanicals, only 4 were regularly preserved in the study area. Over 40% of the botanicals were sourced from the forest and some of the botanicals were harvested by annihilative extraction methods. Over 40% of the botanicals were presently rare on the abundance scale. Sustainable strategies that could enhance the conservation of these species were proposed.
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