(Wines&Vines) - Pressure from grapevine red blotch-associated virus and Pierce’s disease is one of the main reasons most Napa County wine grape growers plan to redevelop vineyards by 2017. 

During the recent harvest, the Napa Valley Grapegrowers surveyed its members about the vintage and their vineyards and found that 86% of those who responded plan to redevelop at least some of their acreage in 2017. About 60% of the members redeveloped acreage in 2015 and 62% said they did this year. 

Brittany Pederson, a viticulturist and pest control advisor with Silverado Farming Co. as well as the co-chair of the Grapegrowers’ member services committee, said more growers are moving to 10- and even five-year replant schedul