Impacts of Grapevine Leafroll Virus on Chardonnay Vines and the Role of Potential Vectors

Research Date
Annemiek Schilder, Rufus Isaacs, Paolo Sabbatini, Brad Baughman, Naidu Rayapati, Mike Merchant
Crop Quality, Disease Management, Pest Management
Crop Categories
Beverage Categories

The goal of this 2-year project was to gain a better understanding of the impact of grapevine leafroll virus disease in Michigan. In the study vineyard, 95-99% of sampled vines tested positive for GLRaV-3 and 19% for Tobacco ringspot virus (TRSV). Fruit yield decreased with increasing severity of foliar leafroll symptoms (up to 88% loss) and Brix decreased by 2-3 degrees. There was an inverse spatial correlation between leafroll and TRSV symptoms. The grape mealybug (Pseudococcus maritimus) was common in SW Michigan and found in NW Michigan for the first time. GLRaV-3 was detected in sampled mealybugs, confirming their role as vectors.

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