Photo 2. Grey leaf spot, Alternaria brassicae, on cabbage. Note the concentric rings typical of Alternaria infections.
Cabbage grey leaf spot
Alternaria brassicae. Another Alternaria fungus, Alternaria brassicicola, cabbage black leaf spot, also occurs, and causes similar symptoms (see Fact Sheet no. 133). Microscopic examination of the spores is needed to distinguish between the two species (Photo 4).
AUTHOR Grahame Jackson and Eric McKenzie
Information from Diseases of vegetable crops in Australia (2010). Editors, Denis Persley, Tony Cooke, Susan House. CSIRO Publishing; and from Gerlach WWP (1988) Plant diseases of Western Samoa. Samoan German Crop Protection Project, Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) Gmbh, Germany. Photo 1 Gerald Holmes, California Polytechnic State University at San Luis Obispo, Bugwood.org. Photo 2 Yuan-Min Shen, Taichung District Agricultural Research and Extension Station, Bugwood.org. Photo 3 Howard F. Schwartz, Colorado State University, Bugwood.org. Photo 4 (taken by Eric McKenzie), and used in this fact sheet, appeared previously in McKenzie E (2013) Alternaria brassicae PaDIL - (http://www.padil.gov.au).
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.
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