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Lesion caused by Phytophthora infestans on potato leaf
collected in Germany
by K. W. Kreiger in 1888. Specimen from Fungi Saxonici number 398
and deposited in the U.S. National Fungus Collections, USDA Beltsville, MD.
This image is taken from the November 1998 Phytopathology Mini-Review by Jean B. Ristaino: "The Importance of Archival and Herbarium Materials in Understanding the Role of Oospores in Late Blight Epidemics of the Past." Click here to download the entire article in the pdf format.
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