Figure 6 - uploaded by Hemant Gohil
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... are several viruses that can cause grapevine leafroll disease, and grapevine leafroll-associated virus-1 and -3 (GLRaV-1 and -3) can be disseminated by mealybugs or scale insects ( Figure 6). Scouting for these vector insects can be done during the season (around bloom) by carefully examining the basal area of shoots and underneath the bark. ...
