Prepared by Patrick E. Lipps,The Ohio State Universityrepresenting members of the USDA NCR-25 Technical Committee on Corn and Sorghum Diseases
Lipps. P.E. 1998. Gray Leaf Sport: A Gobal Threat to Corn Production.APSnet Features. Online. doi: 10.1094/APSnetFeature-1998-0598
Figure 1. Occurrence (%) of gray leaf spot at 24 DEKALB Genetics Corporation corn pathogen monitoring project plot locations and percentage reduced tillage acres from the Conservation Tillage Information Center.
Figure 2. Gray leaf spot distribution as determined by members of the NCR-25 Technical Committee. Risk areas were identified based on reactions of susceptible hybrids, severity of past epidemics, the likelihood of favorable environmental conditions and use of conservation tillage.
For information on gray leaf spot resistant germplasm see:Coates, S. T. and White, D. G. 1994. Sources of resistance to gray leaf spot of corn. Plant Dis. 78:1153-1155.
For information on effect of crop residues on gray leaf spot see:de Nazareno, N. R. X., Lipps, P. E. and Madden, L. V. 1993. Effect of levels of corn residue on epidemiology of gray leaf spot of corn in Ohio. Plant Dis. 77:67-70.
For pictures of different gray leaf spot lesion types see:Freppon, J. T., Lipps, P. E., and Pratt, R. C. 1994. Characterization of the chlorotic lesion response by maize to Cercospora zeae-maydis. Plant Dis. 78:945-949.
For a general review of gray leaf spot see: Latterell, F. M. and Rossi, A. E. 1983. Gray leaf spot of corn: a disease on the move. Plant Dis. 67:842-847.
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