noun
1. : a disease of the cranberry caused by a fungus ( Exobasidium oxycocci ) producing erect flower buds which produce malformed flowers that set no fruit or are sometimes replaced by a whorl of leaves or a branch — called also rosebloom
2. : a similar disease of cranberries caused by a virus and transmitted by a leafhopper ( Scleroracus vaccinii ) — called also Wisconsin false blossom