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Articles by C.L. Igeleke
Total Records ( 3 ) for C.L. Igeleke
  C.L. Igeleke and D.K.G. Ayanru
  Floral and fruit tissues of two cultivars of plantain (Musa paradisiaca L.), P100-F (susceptible) and P200-I (resistant to cigar-end rot disease), grown side by side in a field plot in Benin City, Nigeria, were analysed for eight mineral elements-N, P, K, Ca, Mg, Fe, Na and Zn. Calcium, sodium and zinc concentrations were higher in bracts (0.151, 0.265 and 0.490%) and immature peel (0.520, 0.629 and 0.063%) of the P100-F than in samples of the P200-I cultivar (0.077, 0.210 and 0.032%) and (0.482, 0.490 and 0.032%), respectively. Concentrations of P and K were significantly lower in all tissues analysed of the susceptible (P100-F) than the resistant (P200-I) cultivar. The relevance of these results in relation to the management of cigar-end rot disease of plantain is discussed.
  C.L. Igeleke and D.K.G. Ayanru
  An evaluation of three fungicides, namely, benomyl [methyl l-(butyl-carbamoyl)-2-benzimidazole carbamate], calixin (tridomorph) and dithane M-45 (mancozeb), was carried out for their inhibitory effects on Verticillium theobromae, the causal organism of cigar-end rot disease of plantain (Musa paradisiaca). The LD50 of calixin, benomyl and dithane M-45 in inhibiting mycelial growth, were 0.14, 0.98 and 535.17 μg mL-1, respectively. Calixin was also the most effective in conidial germination inhibition with an LD50 of 21.78 μg mL-1, as compared with dithane M-45 86.39 μg mL-1 and benomyl 275.50 μg mL-1. Germ tubes of the test organism were distorted by the fungicides at varying concentrations. Calixin had greater distortion effect at a lower concentration of 10 μg mL-1, dithane M-45 (100 μg mL-1) and benomyl (1000 μg mL-1). The relevance of these results in relation to the control and management of cigar-end rot disease of plantain is discussed.
  M. Idu , S.E. Omonigho and C.L. Igeleke
  Preliminary studies on the phytochemistry and extracts of water, methanol, chloroform and petroleum ether, of Senna alata flowers were examined for antimicrobial properties. Extracts tested at a final concentration of 500 μg mL-1 produced in vitro antimicrobial activities in assays against clinical isolates of Staphylococus aureus, Candida albicans, Escherichia coli, Proteus vulgaris, Pseudomonans aureginosa and Bacillus subtilis. The zones of inhibitions produced by the extracts in agar diffusion assay against the test micro organisms ranged from 4 to 10 mm while the gentamycin antibiotic control, produced zones that measured 5 mm. Preliminary phytochemical analysis of the plant extracts showed the presence of phenols, tannins, anthraquinoes, saponins, flavonoids.
 
 
 
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