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Climatic accidents and problems encountered |
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| English name | Description | W/O
MC | With
MC | | Hail | Often called a major agrometeorological calamity by farmers, hail represents a threat that harvests will be totally annihilated.
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|  | | Frost | More or less serious depending on its intensity and the time of occurrence during the growing cycle, though in the worst of cases capable of completely destroying a vineyard. | | | | Drop | Drying up of an unpollinated flower or young grape at the first stage of its development; there may be various causes. | |  | Millerandage
| Poor development of grapes owing to incomplete pollination. |
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| | Wind breakage | Unstructured branches can break like glass during strong winds. |
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| | Dehydration | Associated with dry wind, with merlot being highly sensitive. |
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| | Hydric stress | Hydric stress or deficit is referred to whenever plant performance and survival are limited by water shortage. |
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| | Blockage of ripening | Associated with poor sugar formation, with a climatic, i.e., nutritional origin. |
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| | Stalk scorch | This occurs from mid-veraison to the end of veraison, when sugar content is rising, due to stalk and grape scorch, often of nutritional origin. |
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| | Vinestock withering | Premature ageing, poor passing of sap, plugs forming in the vinestock could lead to its death. |
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Vine diseases 