- Flavescence dorée
Flavescence dorée is a bacterial disease of the vine with the potential to threaten
vineyard s. The bacterial agent has recently been named "Candidatus Phytoplasma vitis ", and its vector is theleafhopper , "Scaphoideus titanus ". Infection may kill young vines and greatly reduce the productivity of old vines. It is classified as aphytoplasma disease belonging to the group generically termedgrapevine yellow s.winepros.com.au. Cite web|last= "Oxford Companion to Wine"| title= flavescence dorée |url= http://www.winepros.com.au/jsp/cda/reference/oxford_entry.jsp?entry_id=1192 ] Occurrences are in sporadicepidemic s, and varieties vary in their sensitivity to it.Flavescence dorée first appeared in 1949 in the
Armagnac region of south westFrance . Its insect vector, "S. titanus", was originally native to theEastern United States and Canada and is believed to have been introduced toEurope duringWorld War II . Spreading steadily throughout France, by 1987 it had reached thewine growing regions ofCognac ,Languedoc and northern and southern Rhône, and by 1992 the Loire Valley, and Bordeaux.winepros.com.au. Cite web|last= "Oxford Companion to Wine"| title= grapevine yellows |url= http://www.winepros.com.au/jsp/cda/reference/oxford_entry.jsp?entry_id=1419 ] Variants of the disease are found in Switzerland, Germany, New York state, and Australia.References
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