Plant Protect. Sci., 2008, 44(3):91-96 | DOI: 10.17221/19/2008-PPS

Resistance of apple varieties and selections to Erwinia amylovora in the Czech Republic

Josef KORBA, Jana ŠILLEROVÁ, Václav KŮDELA
Department of Bacteriology, Division of Plant Medicine, Crop Research Institute, Prague-Ruzyně, Czech Republic

Sixty-four apple cultivars and selections of potential interest to apple producers and plant breeders in the Czech Republic were tested for their relative resistance to the fire blight pathogen over six years. Level of fire blight resistance was evaluated according to the extent of lesion development on the shoots tips after artificial inoculation in experimental plots under insectproof nets. Cultivars Quinte (resistant) and Yellow transparent (high susceptible) were included in the tests. Of 64 apple cultivars and selections tested, none were high resistant, 3.1% were evaluated as resistant, 10.9% moderately resistant, 57.8% moderately susceptible, 21.9% susceptible and 6.3% high susceptible. Resistant apple genotypes, showing blight necrosis of shoots of 11-12%, were only cultivars Selena and Quinte. Moderately resistant genotypes (blight necrosis 13.1-25.0%) were Kordona, Golden Smoothee, Julia, HL 323, Melodie, HL 421 and S 634/3. High susceptible genotypes (blight necrosis more then 80.1%) were comprised cultivars Vesna, Topas, Yellow transparent and Vanda. The remaining genotypes were moderately susceptible (blight necrosis 26.1-60.0%) and susceptible (blight necrosis 60.1-80.0%). During six experimental years, quantitative variability was recorded in the blight score. Differences between cultivars in susceptibility to fire blight were often statistically significant.

Keywords: apple cultivars; Erwinia amylovora; fire blight resistance

Published: September 30, 2008  Show citation

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KORBA J, ŠILLEROVÁ J, KŮDELA V. Resistance of apple varieties and selections to Erwinia amylovora in the Czech Republic. Plant Protect. Sci. 2008;44(3):91-96. doi: 10.17221/19/2008-PPS.
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