Corn Smut
Ustilago maydis

• On ears, kernels swell into large pale green to silvery brown galls, up to five inches in diameter
• As the galls on ears mature, they turn purplish black and become spongy
• Powdery, black sooty spores emerge from cracked galls
• Raised, firm pale green to brown bumps form on leaves, stems and tassels
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