taimehaigus, mida tekitavad seeneperekonna Botrytis liigid (tavalisim liik B. cinerea). Taimeosad kattuvad koheva tolmava halli eoskirmega ja mädanevad. Hahkhallitus levib suure õhuniiskuse korral kergesti.
deterioration of grapes caused by a fungus (botrytis cinerea, sclerotina fuckeliana)
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