Variation among foliar isolates of Colletotrichum sublineolum of sorghum in Nigeria

Marley, P S and Thakur, R P and Ajayi, O (2001) Variation among foliar isolates of Colletotrichum sublineolum of sorghum in Nigeria. Field Crops Research, 69 (2). pp. 133-142. ISSN 0378-4290

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Foliar anthracnose, caused by Colletotrichum sublineolum, is a major disease of sorghum in Nigeria. Pathogenic diversity was studied among foliar isolates of C. sublineolum collected from sorghum cultivars in farmers fields in the Sahel, Sudan, northern Guinea and southern Guinea zones of Nigeria during the 1997 crop season. For the study a total of 50 isolates were identified based on typical symptom types and cultural characteristics. On the basis of growth in culture and morphological characteristics, the isolates were classified into nine morphological groups (MGs). Pathogenicity tests were done on a set of known sorghum differential lines by inoculating pot-grown seedlings in a greenhouse. On the basis of disease reaction and disease severity scores on the differential lines, the 50 isolates were classified into seven pathogenic groups (PGs). Sixteen representative isolates of the MGs and the PGs were further evaluated for virulence and aggressiveness on the differential lines and were classified into five distinct groups using the centroid method of cluster analysis. The existence of five races of C. sublineolum in major sorghum growing zones of Nigeria is suggested

Item Type: Article
Subjects: Mandate crops > Sorghum
Depositing User: Library ICRISAT
Date Deposited: 13 Dec 2011 11:26
Last Modified: 16 Sep 2013 12:37
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Acknowledgement: We acknowledge technical assistance by Messrs Abdulrahman Ahmed and Titus Ochibe and thank Messrs D. Jarma and Y. Otitoju for statistical analysis. We are grateful to J.W. Stenhouse and R. Bandyopadhyay, ICRISAT, Patancheru, India for facilitating funding the position of a Visiting Scientist which enabled this work to be carried out, and the Director, IAR for permission to undertake the assignment.
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