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Disease Note. Tomato Ringspot Virus Infection of Common Cinquefoil in the Laboratory. L. Georgi, Department of Plant Pathology, Cornell University, Ithaca, NY 14853. Plant Dis. 71:376. Accepted for publication 13 January 1987. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0376D. Common cinquefoil (Potentilla canadensis L.) was selected as a
possible host for rearing Xiphinema species free from Tomato ringspot
virus (TmRSV) because it is reportedly a good host of the nematode (1)
and is among the plant species in which TmRSV was not detected in a
three-state survey of orchard weeds (2). Rooted runners of P.
canadensis (identified by R. Dirig, L. H. Bailey Hortorium, Cornell
University) were planted in duplicate 20-cm clay pots in soils from three
orchards. The three soils harbored approximately 200, 100, and 30
viruliferous Xiphinema spp. per 100 mi. Plants growing in the first and
second soils became pale and stunted and produced fewer runners than
plants growing in the third soil. Four months after planting, the
symptomatic plants reacted positively for TmRSV in an ELISA
(antisera provided by D. Gonsalves, New York State Agricultural
Experiment Station, Geneva). The plants exposed to the lowest vector
density apparently escaped infection. The reaction of plants exposed to
high vector densities shows that, contrary to published circumstantial
evidence, P. canadensis is a host of TmRSV. |