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Recurrence of Natively Occurring Potato Yellow Dwarf Virus in Minnesota. B. E. L. Lockhart, Professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108. . Plant Dis. 73:321-323. Accepted for publication 27 November 1988. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0321.

Potato yellow dwarf virus (PYDV), which has not been reported from the midwestern United States for the past 40 years, occurred naturally during 1986–1988 in Minnesota in ornamental tobacco (Nicotiana alata), marigold (Tagetes erecta), zinnia (Zinnia elegans), and four-o’clock (Mirabilis jalapa), causing severe stunting, chlorosis, vein yellowing, and systemic vein and leaf necrosis. PYDV also occurred naturally in white clover (Trifolium repens) in mixed infections with clover yellow vein virus. The Minnesota PYDV was identified serologically as a PYDV-S (sanguinolenta) isolate, and its biological properties were similar to those of previously described PYDV-S isolates. Perennial Trifolium spp. may provide reservoirs of both PYDV and its cicadellid vector, Aceratagallia sanguinolenta, which is common in Minnesota.