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Transmission experiment using Pseudococcus comstocki to disentangle mixed viral infection. Original viral source on Pinot noir was displaying very severe symptoms of leafroll disease (A), whereas mealybug transmitted grapevine leafroll-associated virus 3 (GLRaV-3) (B) and mixed-infection GLRaV-3 grapevine virus B (C) on Pinot noir were causing milder leafroll symptoms.
