ISHS Acta Horticulturae 193: XIII International Symposium on Fruit Tree Virus Diseases
RESISTANCE OF SOME PEACH CULTIVARS AND VARIABLE PATHOGENICITY OF THE SHARKA (PLUM POX) VIRUS |
| Authors: | M. Rankovic, D. Šutic |
| Abstract:
The resistance of 15 peach cultivars to a local strain of Sharka virus has been studied. The pathogenicity of this virus strain in peach was checked by observing spread from the inoculation site towards the leaves in the upper part of the crown and to the fruits of infected seedlings of peach cv. Elberta and Prunus persica Stockes. All 15 peach cultivars showed resistance to the virus strain tested, which is common in the area under study (Tab. 1). The virus caused no systemic infection in any cultivar but remained localized in the immediate vicinity of the inoculation site. Sharka symptoms occurred on the fruits of only 3 out of 50 inoculated seedlings of peach cv. Elberta as late as 12 years following inoculation. From one of these seedlings the virus was transmitted by grafting to only 5 of 15 inoculated seedlings of GF 305. Material from this Elberta seedling was simultaneously worked onto 15 GF 305 rootstocks but virus could not be detected in any of these plants in the following year. Sharka virus showed low pathogenicity to seedlings of P. persica Stockes too, because it spread within them very slowly. In leaves from the upper part of the crown virus could not be detected in 10 out of the 12 seedlings tested even 12 years following infection. In addition, the virus did not reach the fruits of the plants tested in any of the cases (Tab. 2). | |
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