Symptoms of Iris yellow spot virus on wild onion.
B. Hellier (1), H.R. Pappu (2), and F. Dugan (1) (1) USDA-ARS, Western Regional Plant Introduction Station; and (2) Department of Plant Pathology, Washington State University, Pullman, WA 99164. Email: hrp@wsu.edu
Iris yellow spot virus (IYSV) is beginning to cause economic losses in both onion seed and bulb crops in Washington State. The virus was confirmed in onion wild relatives being grown in Central Ferry Farm in WA State. Samples were collected in June 2005. Characteristic symptoms include diamond shaped lesions. From left to right: Lesion size increases with age of the infection and the age of the plant at which sampling was done. Individual lesions continue to expand, coalesce and may lead to extensive drying.
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