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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.

References: (1) P. M. Miller. Plant Dis. 64:174, 1980. (2) C. A. Powell et a!. Plant Dis. 68:242, 1984.