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Grapes attacked by noble rot. Botrytis cinerea, popularly known as grey rot, is produced by a phytoparasitic fungus, which carries out its biological cycle on all plant organs, but destructively attacks grapes from the moment they enter the vine (beginning of ripening), if it finds favourable germination conditions (temperature and humidity). If autumn is long and rainless, the fungus develops resistance organs (conidia) and the conidial form Botryotinia fuckeliana appears causing noble rot, which consumes the water in the grapes, dehydrating them and concentrating the sugars and flavours in the raisined berries. They are responsible for the wine with the traditional C.I.B. mention (at Cotnari, on Tarnave, in Dobrogea or at Minis, in good years, wines can be obtained that rival those of Tokaj). (vitic.)

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