Powdery mildew

Scientific term: Erysiphaceae, Erysiphe necator, Oidium

Genus/ Division: Ascomycetes (Ascomycota, Pezizomycotina)


White-grey spots and web-like structures form, comparable to spider webs on and under the leaves. The layer forming on the leaf appears slightly moldy and mealy.


As a result of the disease, the leaves often curl up, the flowers can no longer open and the fruits become hard, turn gray to black, finally it can also come to a seed break and the grapes are no longer suitable for consumption. In addition, growth is restricted and the plant dies.


The wind carries the spores and spreads the disease.

Treatment advices

Coming soon


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  • Viret, Olivier, Werner, Siegfried, Pierre-Henri, Dubuis, and Katia, Gindro. "Echter Mehltau".Eidg. Departement für Wirtschaft, Bildung und Forschung WBF, Agroscope, AMTRA, Version von (2014).