Hort. Sci. (Prague), 2013, 40(2):58-64 | DOI: 10.17221/289/2012-HORTSCI

Evaluation of susceptibility level of pear cultivars to fire blight (Erwinia amylovora) in the Czech RepublicOriginal Paper

J. Korba1, J. Šillerová1, F. Paprštein2, J. Sedlák2, E. Prokinová3, P. Hošková4
1 Department of Bacteriology, Disision of Plant Health, Crop Research Institute, Prague, Czech Republic
2 Research and Breeding Institute of Pomology Holovousy Ltd., Holovousy, Czech Republic
3 Department of Plant Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic
4 Department of Statistics, Faculty of Economics and Management, University of Life Sciences Prague, Prague, Czech Republic

Thirty-three pear cultivars and selections of potential interest to pear producers and plant breeders in the Czech Republic were tested for relative field susceptibility to the fire blight (Erwinia amylovora) over five years. Level of fire blight susceptibility was evaluated according to the extent of lesion development on the shoot tips after artificial inoculation in experimental plots under insect proof nets. Old cvs Alexander Lucas (as resistant standard), Conference (as moderately resistant standard) and Beurré Bosc (as susceptible standard) were included in the tests. The 33 pear cultivars and selections were tested, only one of them was highly resistant (3.0%), 3.0% were evaluated as resistant, 12.1% moderately resistant, 36.4% moderately susceptible, 18.2% susceptible and 27.3% highly susceptible. Breeding selection US 625-63-10 was the only highly resistant pear genotype (necrosis of shoots of 0-7.0%). Resistant genotype group (necrosis 7.1-13.0%) comprised US 625-63-4. Moderately resistant genotypes (necrosis 13.1-25.0%) included cvs Alexander Lucas, Alfa, Bohemica and HL 31-50-31. Highly susceptible genotypes (necrosis more than 80.1%) included cvs Vonka, Karina, Bona, Decora, Elektra, Milka, Regina, Alice and TE 4763. The remaining genotypes were moderately susceptible (necrosis 26.1-60.0%) and susceptible (necrosis 60.1-80.0%).

Keywords: bacterial disease; pome fruit trees; fire blight susceptibility

Published: June 30, 2013  Show citation

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Korba J, Šillerová J, Paprštein F, Sedlák J, Prokinová E, Hošková P. Evaluation of susceptibility level of pear cultivars to fire blight (Erwinia amylovora) in the Czech Republic. Hort. Sci. (Prague). 2013;40(2):58-64. doi: 10.17221/289/2012-HORTSCI.
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