ISHS Acta Horticulturae 704: X International Workshop on Fireblight
EVALUATION OF RESISTANCE TO FIRE BLIGHT IN CZECH PEAR CULTIVARS |
| Authors: | F. Paprstein, J. Kosina, J. Korba, J. Sillerova |
| Keywords: | pear, cultivars, rootstocks, breeding, artificial infection, yield, growth vigour |
| Abstract:
Newly bred Czech pear cultivars (14 cultivars) were tested for resistance to fire blight. Tests were carried out in the research station of RICP in Slany. Tested cultivars were grown in technical isolation. Artificial inoculations were carried out in the period of strong extending growth. Inoculations were done by decapitation of shoot tips by scissors dipped in the bacterial suspension (concentration 106 cfu/ml) composed of 5 virulent strains of Erwinia amylovora. Virulence of pathogen was verified by testing on forced shoots of Pyrus ussuriensis. The level of resistance was determined by percentage share of bacterial lesions to total length of shoots (in cm) after 40 days. We used adjusted USDA scale for evaluation. Tests proved high resistance to fire blight in cultivars ‘Bohemica’ (higher than in ‘Lucasova’) and ‘Jana’. This resistance was comparable to the resistant control US-62563-004. On the other hand, cultivars ‘Isolda’, ‘Vonka’, ‘Beta’, ‘Decora’ and ‘Petra’ showed strong symptoms of infection. Growth and yield characteristics of three cultivars (‘Red Bartlett’, ‘Conference’, ‘Alexander Lucas’) on rootstocks resistant to fire blight were evaluated in an experimental orchard at RBIP Holovousy. The following rootstocks were tested: OHxF 69, 87, 230 and 333. Based on the present results, OHxF 87 rootstock appears to be the best for all three cultivars concerning growth and yield. | |
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