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Etiology

A Relationship Between Flat Apple Disease and Cherry Rasp Leaf Disease. C. L. Parish, Research Plant Pathologist, U. S. Department of Agriculture, Agricultural Research Service, P. O. Box 99, Wenatchee, WA 98801; Phytopathology 67:982-984. Accepted for publication 28 February 1977. Copyright © 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-982.

Inoculum from three sources of flat apple disease induced symptoms of rasp leaf when inoculated into sweet cherries. Similarly, cherry rasp leaf virus from three sources induced symptoms in apple identical to those associated with flat apple disease. Orchard surveys showed that the agent of flat apple disease spreads in the field in a manner that indicates a soil-borne vector. It is postulated that flat apple and cherry rasp leaf may be caused by the same virus.