Ustilago maydis. Bubble smut is a pest fungus that has affected the corn cob. Selective focus.

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Keywords: agriculture, biology, corn, corncob, damage, disease, farming, field, fungal, fungus, gmo, harvest, huitlacoche, lab, maize, maydis, mushroom, nature, organic, outdoor, pathogen, pathogenic, plant, science, seed, smut, species, spore, toxic, tumour, ustilago, vegan, vegetable