Powdery mildew
Scientific term: Erysiphaceae, Erysiphe necator, Oidium
Genus/ Division: Ascomycetes (Ascomycota, Pezizomycotina)
Features
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.
Consequences
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.
Spread
The wind carries the spores and spreads the disease.
Treatment advices
Coming soon
Sources
B. Altmayer, B. Fader, M. Harms, R. Ipach, U. Ipach, H.-P. Lipps, K.-J. Schirra, B. Ziegler (2010): Sachkunde im Pflanzenschutz (Weinbau). 6. Überarbeitete Auflage. Dienstleistungszentrum Ländlicher Raum (DLR) Rheinpfalz, Abteilung Phytomedizin. Neustadt an der Weinstraße. And P.M. Kirk, P.F. Cannon, D.W. Minter and J.A. Stalpers CABI Europe - UK (Hrsg.) (2011): Ainsworth & Bisby's Dictionary Of The Fungi. 10. Auflage. CPI Group (UK) Ltd. Croydon. ISBN 978-1-84593-933-5
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).