Grero, red grape variety found in Umbria in its native Italy. It has a medium-large bunch usually loosely packed. It is resistant to most common grapevine diseases but but is susceptible to peronospera (downy mildew).
Viticulture: The bunch is medium-large, and usually loosely packed. It is resistant to most common grapevine pests but is susceptible to peronospora (downy mildew).
See: Tabarrini (Montefalco).
Italian Wine Unplugged (Positive Press, 2017), p.254.