Botrytis cinerea is a necrotrophic fungus that affects many plant species, although its most notable hosts may be wine grapes. In viticulture, it is commonly known as “botrytis bunch rot”; in horticulture, it is usually called “grey mould” or “gray mold”. The fungus gives rise to two different kinds of infections. The first, grey rot, is the result of consistently wet or humid conditions, and typically results in the loss of the affected bunches. The second, noble rot, occurs when drier conditions follow.

Learn more: https://pubmed.ncbi.nlm.nih.gov/20507522/