© Purdue University, Plant and Pest Diagnostic Laboratory
Pathogen(s) causing disease:
Corn growing areas of the world. Infections are most serious in warm, temperate and tropical areas.
Small (1/8-1/4 in), oblong leaf lesions with rounded ends and parallel sides. Lesions are commonly tan with brownish borders, appearing first on lower leaves (Race O).
Favored by extended warm, wet, humid weather, minimum tillage, and continuous corn.
Resistant hybrids. Foliar fungicides may be useful in seed production fields. Cleanly plow under infected residue. Crop rotation.