Efficacy of Some Plant Extracts in In Vitro Control of Colletotrichum Species, Causal Agent of Yam (Dioscorea rotundata Poir) Tuber Rot

Efficacy of some plant extracts (Piper nigrum, Zingiber officinale, Azadirachta indica, Carica papya and Nicotiana tabacum) and a chemical fungicide (mancozeb) using three concentrations of hot aqueous plant extracts (30, 60 and 90 g/l) and mancozeb (4, 8 and 12 g/l) in in vitro inhibition of Colletotrichum sp. mycelia was carried out at Advanced Plant Pathology Laboratory, Federal University of Agriculture, Makurdi, Nigeria. Rotted yam tubers were collected from farmers’ barns and taken to the laboratory for isolation and identification of fungal organisms. Colletotrichum sp. was subsequently isolated and identified based on microscopic examination and its morphological characteristics from the pure culture of the fungus. 5 ml of each extract and the chemical fungicide were separately amended in 15 ml of potato dextrose agar and the pathogen was inoculated in the plates and incubated for 120 h and measurement of mycelia radial growths were recorded at 24 h interval throughout the period of incubation. The results obtained showed that all the plant extracts at all concentrations significantly (p
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