General term for the yellowish discolouration of the leaves of the vine. This can be caused by a lack of nutrients (e.g. manganese) or as a consequence of diseases. Both viruses and insects such as cicadas can act as pathogens or carriers:
See also a complete list of all vine pests and vine diseases under Vine Enemies and the keywords there for further information.
Picture left: © H. Reisenzein - AGES Wien
Picture right: The virtual vine doctor - Infodienst Weinsberg
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Prof. Dr. Walter Kutscher
Lehrgangsleiter Sommelierausbildung WIFI-Wien