The Plant Pathology Journal 2006;22(1):28-35.
Published online March 31, 2006.
Characterization of Sclerospora graminicola Isolates from Pearl Millet forVirulence and Genetic Diversity
B. Pushpavathi, R. P. Thakur, K. Chandrashekara Rao, V. P. Rao
Abstract
Virulence and genetic diversity were studied using 21 isolates of Sclerospora graminicola, the pearl millet downy mildew pathogen collected from major pearl millet growing areas of India. Variability for virulence was determined by inoculating a set of 10 differential hosts with the S. graminicola isolates in a greenhouse. The isolates varied for latent period (6.4 to 11 days), disease incidence (0 to 98%), virulence index (0 to 18.7) and oospore-production potential (1 to 4). Among the 21 isolates, Sg 139 (Rajasthan) was the most virulent and Sg 110 (Tamil Nadu) the least virulent. Based on virulence index (disease incidence
Key Words: downy mildew, Pennisetum glaucum, Sclero-spora graminicola, virulence diversity


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