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Occurrence of Peronosclerospora sorghi in Uganda

July 1998 , Volume 82 , Number  7
Pages  757 - 760

G. Bigirwa , Former Graduate Student , and E. Adipala , Plant Pathologist, Department of Crop Science, Makerere University, P.O. Box 7062, Kampala, Uganda ; and J. P. Esele , Plant Pathologist, Serere Agricultural and Animal Production Research Institute, Soroti, Uganda

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Accepted for publication 9 March 1998.

A study was conducted to determine the occurrence and severity of sorghum downy mildew on three major hosts (maize, sorghum, and Johnson-grass) in Uganda. Five surveys were conducted in four growing seasons, between 1994 and 1995. The disease was encountered in 11 of the 22 districts surveyed. In the majority of the areas, incidence was less than 10%, but it was significantly higher (P < 0.05) in the second season of 1994 than in the first season of 1995. Soil type significantly (P = 0.001) influenced the incidence of sorghum downy mildew, with high incidence being associated with sandy soils, followed by loamy soils, and lowest incidence in clay soils. Incidence, shredding, and oospore production were comparatively higher on sorghum and Johnson-grass than on maize.

Additional keywords: collateral host, conidia, epidemiology, yield loss

© 1998 The American Phytopathological Society