AxR1
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AxR1 is a grape rootstock once widely used in California viticulture. Its name is an abbreviation for "Aramon Rupestris Ganzin No. 1", which in turn is based on its parentage: a cross of Aramon, a Vitis vinifera cultivar, with Rupestris Ganzin, a selection of the American grape species, Vitis rupestris.
It achieved a degree of notoriety in California when, after decades of recommendation as a preferred stock, its resistance to phylloxera broke down in the 1980s, resulting in the failure of a number of vineyards and requiring extensive replanting.
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