Rougeot: nm Rougeot (or rougeau or brenner) parasitic on the vine is manifested by the reddening of the leaves due to an injury (often accidental) impeding the circulation of the sap. It is indeed a disease which causes the stoppage of the migration of the sugars produced in the leaves. The leaves dry out little by little along with a reddening. The effects are imperfect hardening and incomplete ripening. Some grape varieties are more sensitive to it, such as Chard...
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