The fungus Botrytis cinerea , head of gray mold on grapes, find the best conditions for its development in the spring, with average temperatures, abundant moisture and prolonged rain. On the leaves of the vine damage consists of brown spots, often covered by the typical gray mold. Towards the end of June the fungus strikes, apparently without causing damage to those parts of the cluster that are in bloom. This period is instead the most dangerous, because, after the grapes in bulk, the fungus inside the cluster will Then, the optimal conditions for growth to result in serious decay. It is believed that infections are possible when the surface of the cluster is covered with a thin layer of water for at least 15 hours.
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