Leafroll virus has been an ongoing problem in the vineyard industry for many years. Recently, there has been heightened awareness as some new vineyards planted to certified virus-free nursery stock began to show leafroll symptoms a few years after planting. In most cases, these vineyards are planted adjacent to older vineyards that are showing leafroll symptoms. Previously, it was believed by many people that the main method of virus transmission was by propagating vines from infected wood and that, at least in California, insect transmission was not that significant. But closer studies are changing what was once seen as common knowledge.

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