Green ring mottle virus
(Green Ring Mottle Virus)
The virus produces symptoms on sour cherry, primarily the variety Montmorency. Apricot, peach, and sweet cherry are symptomless hosts. Yellow mottling with irregularly shaped green islands or rings appear on the leaves of infected trees (A). A less common symptom is yellowing of the lateral veins, usually accompanied by a tip distortion (B). Fruit are misshapen with corky-brown, discolored pits, streaks or rings in the epidermis that extend into the flesh of the fruit. Infected fruit are bitter.
Common to all fruit-growing regions in eastern North America.
May be confused with sour cherry yellows but can be differentiated by noting the presence of green blotches. The two viruses, however, may be found infecting the same tree, thus symptoms of both diseases may be evident.
No insect vector has been identified, but the disease appears to spread slowly in the orchard to neighboring trees, suggesting the role of root grafts. Infected trees should be removed. Management hinges on planting virus-certified trees.
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