© Purdue University, Plant and Pest Diagnostic Laboratory
Pathogen(s) causing disease:
Bipolaris maydis
Location:
Corn growing areas of the world. Infections are most serious in warm, temperate and tropical areas.
Symptoms:
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).
Conditions:
Favored by extended warm, wet, humid weather, minimum tillage, and continuous corn.
Management:
Resistant hybrids. Foliar fungicides may be useful in seed production fields. Cleanly plow under infected residue. Crop rotation.