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Pathogenicity, Host Range, and Distribution of Colletotrichum graminicola on Corn. Harry Wheeler, Professor, D. J. Politis, Graduate Assistant, Department of Plant Pathology, and C. G. Poneleit, Associate Professor, Department of Agronomy, University of Kentucky, Lexington, 40506. Phytopathology 64:293-296.

All isolates of C. graminicola obtained from corn (Zea mays L.) during 1968-1971 (a total of 30 isolates from six different states) readily attacked nonwounded corn seedlings.  Isolates from nine other grass genera failed to attack corn.  Corn isolates attacked all members of the genus Sorghum tested, but failed to produce symptoms on oats, barley, wheat, tall fescue, or millet.  Low light intensity and prolonged periods of high humidity appear to be important environmental factors which increase disease severity.  The ability of corn isolates to attack both corn and sorghum, including sorghum cultivars resistant to isolates of C. graminicola from sorghum, indicates that a race of this fungus potentially capable of causing severe damage to both plants is widely distributed in the United States.