沒經驗但是搜索了一下，估計是這個

Gray mold or bunch rot is caused by a nearly ubiquitous fungus (botrytis) that infects flowers in bloom, as well as ripening fruit. Infections that occur during bloom may go unnoticed because the pathogen remains latent until the fruit’s sugar levels rise as ripening occurs. Once the fruit rot symptoms develop, the pathogen moves through the cluster stem infecting all or most of the berries in a cluster. Infections also can become established in ripening fruit when this fungus enters berries injured by the grape berry moth.

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• 非常感謝 -曉龍東雲- ♂ (0 bytes) () 07/14/2020 postreply 05:55:42