A family of fungi that cause powdery mildew, a common plant disease characterized by white powder-like coating on leaves.
From the genus Erysiphe (Greek erythros 'red' possibly referring to diseased appearance) combined with the taxonomic suffix -aceae indicating a plant family. The family classification emerged as fungal taxonomy developed.
Powdery mildew fungi in this family have been plaguing gardens for thousands of years, and different species specialize in attacking different plants—some only infect roses, others only grapes, showing incredible evolutionary specialization!
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