Stick with American varieties (Vitis labrusca) grown on their own roots to avoid the mildew and root louse
(phylloxera) problems common to European grapes (V.
UC Davis researchers believe that vine decline reported at several vineyard sites in Northern California is caused by fungus spread by the phylloxera root louse
Much research, too, goes toward breeding more robust vines, especially ones resistant to the infamous root louse
The effort will involve computers to enable scientists to understand how, whsy and where the root louse
Equally riveting was the presentation on phylloxera, the grape root louse
that has recently raised its ugly head (because AXR-1 was used for a lot of vineyards in Napa Valley and is not resistant to phylloxera, roughly half of Napa's vineyards will have to be replanted).
Larry Brooks from Acacia had the right focus on the pesky root louse
that again threatens vineyards not planted with resistant rootstock.
Fifty % saw the root louse
as a potential threat and 25% found the threat minimal; 45% of the growers have plans to replant to cope with phylloxera.