Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun onion_mildew

1 sense of onion mildew

Sense 1
onion mildew, Peronospora destructor -- (fungus causing a downy mildew on onions)
       => downy mildew, false mildew -- (any of various fungi of the family Peronosporaceae parasitic on e.g. grapes and potatoes and melons)