Word: rootstock
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Dates: during 1990-1999
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Phylloxera can be stymied by regrafting grape buds onto resistant varieties of rootstock. No such defense is available against PD. The sharpshooter aphids attack the moisture-carrying vessels of vines and can kill them off in a year. Particularly vulnerable are vineyards near lakes and rivers, where the bug lives, since spraying with pesticides is banned because of the danger to fish and water. In case of a sharpshooter onslaught, says viticulturist Jim Wolpert of the University of California at Davis, a grower's only recourse is to "yank the vines and start over...
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