Translations for „Grey mould“ Become a Premium Member today! German designation (also grey mould) for the mould Botrytis; see there. Botrytis Mostly used short name for Botrytis cinerea (synonym Botryotinia fuckeliana) for the mould fungus from the genus Botrytis which is called grey mould rot (also grey rot, grey mould, sour rot...