Biology and over-winter survival of Iris yellow spot virus in Colorado
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Iris yellow spot virus (IYSV) (Family: Bunyaviridae, Genus: Tospovirus) and its insect vector, Thrips tabaci Lindeman, are of economic concern in onion (Allium cepa L.) growing regions worldwide. IYSV symptoms appear on onion foliage as tan or straw colored, elongate diamond shaped lesions. Accumulated lesions may coalesce on the foliage or girdle the scape, causing lodging and loss of seed. There is no evidence that Tospoviruses, including IYSV, are seed transmitted. Onion seed included in double antibody sandwich enzyme linked immunosorbent assays (DAS-ELISA) to detect IYSV occasionally ...