Three Previously Unrecorded Viral Diseases of Astilbe, Fuschia, and Thermopsis Species in Minnesota

Plant Disease
B Lockhart

Abstract

Interest in virus diseases of perennial ornamentals has been increasing because of their increasing monetary value, because wholesale producers perceive an advantage in marketing disease-free stock, and because widespread international movement of these plants carries the risk of introduction of exotic viruses. In an ongoing study to identify and document viral diseases of perennial ornamentals used in the United States commercial horticultural industry, three virus-like diseases of astilbe (Astilbe chinensis), fuschia (Fuschia cv. Gartenmeister) and false lupine (Thermopsis caroliniana) occurring in Minnesota were investigated. Symptomatic plants were selected from lots in commercial greenhouses and garden centers in several locations in Minnesota. Astilbe with systemic chlorosis was found to be infected with Tobacco ringspot virus (TRSV). Fuschia with leaf mottling and leaf deformation was found to be infected with Cucumber mosaic virus (CMV), and false lupine with mosaic and leaf deformation symptoms was found to be infected with Bean yellow mosaic virus (BYMV). Identification of the three viruses was based on: 1) virion presence and morphology in partially purified leaf extracts using electron microscopy (EM) and immunosorb...Continue Reading

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