The Ascomycetes are the sac fungi: the fungi that produce asci (sing, ascus, sac) in which ascospores are borne. This group includes the yeasts that leaven the bread and brew the beer; the molds that make penicillin; and, the morels of the dinner table. This group also includes great destroyers—the pathogens that cause Dutch elm disease, chestnut blight, apple scab, brown rot of stone fruits, the powdery mildews, and many, many others.
KeywordsPowdery Mildew Stone Fruit Apple Scab Chestnut Blight Dinner Table
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