Leotiomycetes are a class of ascomycete fungi causing many serious plant diseases, such as powdery mildew and gray mold, typically growing on the surface of the plant.
The spores are hyaline, of various shapes, and are released through a circular apical pore.
To prevent powdery mildew from forming in the first place, avoid low-temperature, high-humidity environments. Do not crowd plants. Do not grow susceptible plants in the shade. Water the soil, not the plants.
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