Penicillium oxalicum causes lesions on husks, rotten ears and streaked kernels.
Effect on Seed Quality:
Seeds are discolored, germination is reduced and a seedling blight can occur. Penicillium oxalicum produces oxalic acid, which is toxic to seedlings. This effect is enhanced in pericarp-injured seeds (Koehler, 1957).
Infected seedlings are yellow and show retarded growth. Ears show a blue-green powdery growth on and between kernels; this also forms on the cob surface, usually near the tip. Seeds may be bleached and streaked. In storage, the fungus fruits below the pericarp in the germ, producing the condition known as blue eye.
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