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Disease Note.

Viruses Detected in Fushuai, a New Apple Cultivar from the People’s Republic of China. Z. Li, Fruit Tree Research Institute, Zhengzhou, Henan, People’s Republic of China. G. I. Mink, Washington State University, Irrigated Agriculture Research and Extension Center, Prosser 99350. Plant Dis. 73:81. Accepted for publication 20 October 1988. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0081C.

Fushuai, a newly developed apple cultivatar from the People's Republic of China (1), was indexed on the woody greenhouse indicator clones R12740-7A, Hopa, Sparkler, Radiant and Virgina Crabs, spy 227, Nouveau Poiteau, Lord Lambourne, Golden Delicious, and Red Delicious, as well as on herbaceous indicator plants and by enzyme-linked immunosorbent assay. The following viruses were indentified: apple chlorotic leaf spot, apple stem pitting (ASPV), pear vein yellows strain of ASPV, apple stem grooving, and apple mosaic. Inoculated Red and Golden Delicious trees showed pronounced leaf distortion, necrotic spotting, and chloritic mottle. The casual agent of this previously unreported sympotom has not yet been determined. The first introduction of this cultivar into the United States was illegal, and our results suggest that clones of Fushuai not heat-treated should be regarded as high risk for subsequent propagation and distribution in the United States. Reference:(1) Z.N. Guo and G. N. Guo. HortScience 19:726, 1984.