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1 January 2007 Dalmatian Toadflax (Linaria dalmatica): New Host for Cucumber Mosaic Virus
Courtney L. Pariera Dinkins, Sue K. Brumfield, Robert K.D. Peterson, William E. Grey, Sharlene E. Sing
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To date, there have been no reports of Dalmatian toadflax serving as a host for cucumber mosaic virus (CMV). Infestations of Dalmatian toadflax may serve as a reservoir of CMV, thereby facilitating aphid transmission of CMV to both agricultural crops and native plants. The goal of this study was to determine whether Dalmatian toadflax is a host for CMV. Dalmatian toadflax seedlings were randomly assigned to two treatments (18 replicates/treatment): no inoculation (control) and inoculation with CMV (Fast New York strain). The Dalmatian toadflax seedlings were inoculated by standard mechanical methods and tested for the presence of CMV using enzyme-linked immunosorbent assay (ELISA). Ten of the 18 CMV-inoculated toadflax plants tested positive for the virus; 6 of the 18 displayed systemic mosaic chlorosis and leaf curling. All control plants tested negative. Transmission electron microscopy obtained from CMV-positive plants confirmed the presence of CMV based on physical properties. To verify CMV infestation, tobacco plants were assigned to the following treatments (six replicates/treatment): no inoculation (control), CMV-negative (control) inoculation, and a CMV-positive inoculation. Plants were inoculated by standard methods. Five of the 6 tobacco plants treated with the CMV-positive inoculum tested positive for CMV using ELISA. All control plants tested negative for the virus.

Nomenclature: Dalmatian toadflax, Linaria dalmatica (L.) Mill. LINDA, tobacco, Nicotiana tabacum L, cucumber mosaic virus

Courtney L. Pariera Dinkins, Sue K. Brumfield, Robert K.D. Peterson, William E. Grey, and Sharlene E. Sing "Dalmatian Toadflax (Linaria dalmatica): New Host for Cucumber Mosaic Virus," Weed Technology 21(1), 41-44, (1 January 2007).
Received: 12 January 2006; Accepted: 1 April 2006; Published: 1 January 2007

Agdia Immunostrip
CMV Fast New York strain
invasive species
risk assessment
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