The numerous enemies of the grapevine are divided into the groups of microorganisms such as bacteria, fungi and viruses, as well as animal pests (insects, worms, mammals), which act indirectly through the transmission of diseases or directly through root feeding or consequential damage such as rot. Some diseases are also caused by a lack of nutrients. Many diseases are of European origin, some were "imported" from North America from the middle of the 19th century. These were, in chronological order, phylloxera, powdery mildew (Oidium), downy mildew (Peronospora) and black rot, which were referred to as the "four great plagues", as well as flavescence dorée (golden yellowing) from eastern North America in the 1940s.
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Thorsten Rahn
Restaurantleiter, Sommelier, Weindozent und Autor; Dresden