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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730 EISSN: 1021-9730
Vol. 4, No. 1, 1996, pp. 111-113
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Bioline Code: cs96047
Full paper language: English
Document type: Short Communication
Document available free of charge
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African Crop Science Journal, Vol. 4, No. 1, 1996, pp. 111-113
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Survey of Leaf Spot-causing Microorganisms on Yams
Amusa, A.N.; Ikotun, T. & Bankole, J.O.
Abstract
A survey of leaf-spot pathogens of cultivated Dioscorea
alata and D. rotundata in Nigeria was conducted.
Colletotrichum gloeosporioide was the predominant
organism judging by its frequencies of occurrence of 45.6% and
42.7% in 1992 and 1993, respectively. Other fungi found
associated with yam leaf-spot included Curvuloria
eragrostides, Pestalotia macrotrichia, Sclerotium rolfsii,
Rhizoctonia solani, Colletotrichum graminicola, C.
lindemuthianum, Botryodiplodia theobromae, Curvuleria
pallanscen, Fusarium oxysporum and Macrophorria sp.
In pathogenicity test, however, only C. glocosporioides, C.
graminicola, S. rolfsii, R. solani, eragrostides and P.
macrotrichum were able to induce necrotic lesions on
leaves of both D. alata and D. rotundata,
suggesting that only these organisms were the primary
leaf-spot pathogens of yams.
Keywords
Diascorea alata, D. rotundata, fungi, pathogenicity
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Amusa, A.N.; Ikotun, T. & Bankole, J.O.
Résumé
Une enquete sur les pathogenes de taches foliaires
d'ignames cultives, le Dioscorea alata et D.
rotundata, etait effectuee au Nigeria. Le
Calletotrichum glaeasporioride etait l'organisme
predominant de part sa frequence d'apparition de 45,6% et
42,7% en 1992 et 1993, respectivement. Les autres champignons
associes au taches foliaires d'ignames etaient notamment
Curvuloria eragrostides, Pestalatia macrotrichia,
Scleratium rolfsii, Rhizoctania solani, Colletotrichum
graminicola, C lindemuthianum, Batryadiplodia theobromae,
Curvuleria pallanscen, Fusarium oxysparum et
Macrophorria sp. Cependant, au point de vue de test de
pathogenecite, il n'y avait que C glacosporioides, C
graminicala, S. rolfsii, R. solani, eragrostides et P.
macratrichum qui etaient capable d'induire des lesions
necrotiques sur les feuilles de D. alata et D.
rotundata; ce qui suggere que seuls ces organismes
etaient les pathogenes primaires de taches foliaires
d'ignames.
Mots Clés
Dioscorea alata, D. rotundata, champignon, pathogenecite
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© Copyright 1996 - African Crop Science Society
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