Though Washington’s wine industry is considered relatively young, many vineyards planted years ago now show signs of aging and loss of productivity from winter injuries, virus, crown gall and such. As the industry enters a period of replanting, nematodes that previously were not a problem are now of great concern.This period of replant was expected. Research supported by the Washington State Wine Commission on behalf of the state's wine grape growers and wineries was initiated more than a decade ago to prepare for the eventual need to replant vineyards in soils where populations of plant-parasitic nematodes have built up over years of grape production. Though nematodes have been well studied in other wine regions, little was known about the microscopic roundwormsin Washington vineyards, and growers have lacked basic preplant and postplant management knowledge needed for replanting decisions.
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