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Cottony mycelial growth with dark, spherical cleistothecia of Erysiphe graminis, the powdery mildew fungus, on barley. (Courtesy D. Mathre) |
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Cottony mycelial growth with dark, spherical cleistothecia of Erysiphe graminis, the powdery mildew fungus, on barley. (Courtesy D. Mathre) |