Vine Characteristics
The majority of Vitis labrusca grape varieties are red (though white varieties such as Niagara and "pink-skinned" varieties such as Catawaba exist), with dark colored berries high in phenolic compounds that produced strongly flavored wines. As the berries near harvest and become fully ripe, they separate easily from the pedicel (berry stem). If the berry is squeezed gently between two fingers, the thick skin will slip easily off leaving the pulp intact as a ball. This trait gives Vitis labrusca the name of "slip skin" grapes. Another trait of labrusca that aids ampelographers in identification of vines and hybrid varieties descended from the species is the large, thick leaves of the vines that have a hairy underside with dense brown or white hairs.
Like many other American vine species, Vitis labrusca has some natural resistance to many grape diseases, including phylloxera. However, its resistance and grafting compatibility is not as high as other species, such as Vitis aestivalis, Vitis rupestris and Vitis berlandieri, and is not often used for commercial rootstock.
Read more about this topic: Vitis Labrusca
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