ISHS Acta Horticulturae 235: XIV International Symposium on Fruit Tree Virus Diseases
FURTHER STUDIES ON THE RESISTANCE OF PLUMS TO SHARKA (PLUM POX) VIRUS |
| Authors: | M. Rankovic, S. Paunovic |
| Abstract:
The paper presents the results of ten-year comparative investigations on the resistance of 25 plum cultivars and hybrids to sharka virus (PPV). Studies were conducted in an experimental planting set up for this purpose under conditions of severe sharka virus infection. In addition to testing the resistance to the most widespread local virus strain, the response of plum trees to the inoculation with a mild PPV strain in mixture with chlorotic leaf spot (CLSV) and prune dwarf virus (PDV) was also studied. On the basis of the results obtained, the cultivars tested were classified as follows: highly sensitive (4), sensitive (13) and tolerant (8). The group of highly sensitive and sensitive cultivars also inludes 5 cultivars which react to sharka by premature shoot and tree dieback, bark splitting and swellings on the branches. The mild PPV strain in mixture with CLSV and PDV in some cultivars had a cross-protection effect, whereas in the others it showed severe virulence. | |
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