VIEW ARTICLE

Etiology

Andean Potato Calico Strain of Tobacco Ringspot Virus. C. E. Fribourg, Associate Professor, Departamento de Sanidad Vegetal, Universidad Nacional Agraria, Apartado 456, Lima, Perú; Phytopathology 67:174-178. Accepted for publication 19 July 1976. Copyright © 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-174.

Tobacco ringspot virus (TRSV) was isolated from Peruvian potato cultivars showing yellowing symptoms that resemble potato calico disease. The virus is widespread in different potato growing areas of Peru. It produced typical symptoms of TRSV in most indicator hosts, but unusual necrotic local lesions in Cucumis sativus and systemic apical necrosis in Chenopodium quinoa, C. amaranticolor, and Petunia violaceae. Its dilution end point was 10^–4-10^–5, thermal inactivation point 55-60 C, and longevity in vitro 9-11 days. In immunodiffusion tests, the virus and its homologous antiserum formed spurs against TRSV strains NC-38, NC-39, NC-72, and NC-87 from tobacco and against the Eucharis mottle and Texas strains. In reciprocal tests, spurs also were produced against all these six strains. The virus can be considered as a new strain of TRSV and the name Andean potato calico strain is proposed.