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Journal of Applied Sciences
Year: 2007  |  Volume: 7  |  Issue: 4  |  Page No.: 531 - 535

Evaluation of Fungicides on Growth and Conidial Germination of Verticillium theobromae Isolated from Plantain

C.L. Igeleke and D.K.G. Ayanru    

Abstract: 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.

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