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Phylloxera: Tiny aphids or root lice that attack Vitis vinifera roots. The vineyard pests were widespread in both Europe and California during the late 19th century, and returned to California in the 1980s.
Grafting: Uniting two plants so they grow as one. Most often used to join phylloxera-resistant rootstock with vitis vinifera buds that will bear fruit.
Rootstock: Disease-resistant native American grapevine grown specifically to provide a root system on which to graft Vitis vinifera varieties. Most of the world takes these measures to prevent attacks of phylloxera.
Vitis Aestivalis: A hardy grape native to North America, hybrids of Vitis aestivalis are sometimes used for winemaking, the most prominent of which is the Norton grape.
Oïdium: Also known as powdery mildew, oïdium is a fungal disease that infects areas of green growth on grape vines, particularly Vitis vinifera varieties. Grapes afflicted with the powdery or cobweb-like fungus are generally discarded.
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