peronospora destructor

English Thesaurus

1. fungus causing a downy mildew on onions (noun.plant)

hypernym	:	downy mildew, false mildew,
definition	:	any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons (noun.plant)

member meronym	:	genus peronospora, peronospora,
definition	:	genus of destructive downy mildews (noun.plant)