In Austria sometimes used, but actually wrong name (because it can occur in all grape varieties) for the vine disease grape wilt; see there.
A presumably new vine disease that appeared in Austria and Germany from the end of the 20th century onwards (in 2002 for the first time massively and area-wide). The name Zweigelt disease (which has unfortunately become common in the meantime) arose from the fact that it was apparently mainly the Zweigelt grape variety that was affected. However, all other varieties have also been affected (with slightly different symptoms), so this designation is somewhat misleading. Sensitive varieties susceptible to this disease besides Zweigelt are Blauburger, Grüner Veltliner, Pinot Noir, Rotgipfler, St. Laurent and Zierfandler.
The first symptoms appear with the véraison (beginning of ripening). All of a sudden, the berries of whole grapes slacken, shrivel or wilt. In contrast...
For me, Lexicon from wein.plus is the most comprehensive and best source of information about wine currently available.
Egon Mark
Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)