Rupestris stem pitting virus
Rupestris stem pitting virus causes a slow decline of vinifera cultivars and interspecific hybrids. The main symptoms are delayed bud break, poor spring growth, stunting of infected plants and a decline in yield. No leaf discoloration is observed. When the bark is peeled off the trunk, the wood may reveal the presence of small pits. This virus mainly spreads via planting material.
Tests have shown that the disease is widespread in French-American hybrids in commercial vineyards in the northeastern United States and Canada.
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