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- Dictionarypowdery mildew
noun
- 1. mildew on a plant which is marked by a white floury covering consisting of conidia.
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noun
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Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales. Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive. Infected plants display white powdery spots on the leaves and stems. This mycelial layer may quick... Wikipedia