ISHS Acta Horticulturae 590: IX International Workshop on Fire Blight
HOST-PATHOGEN INTERACTIONS OF ERWINIA AMYLOVORA ON APPLE AND PEAR IN NEW ZEALAND |
| Authors: | R.K. Taylor, C. Ranatunga, V. Bus, P.A. Alspach |
| Keywords: | fire blight, Erwinia amylovora, phenotyping, host-pathogen interactions |
| Abstract:
Host-pathogen interactions were studied between 100 New Zealand isolates of Erwinia amylovora and seven Malus and three Pyrus cultivars. All cultivars developed symptoms, but the severity of the disease varied significantly. Among the apple accessions, ‘Robusta 5’ was highly resistant; ‘Splendour’, ‘Red Delicious’ and ‘Liberty’ moderately resistant; ‘Royal Gala’ and ‘Braeburn’ were susceptible; and ‘Pinkie’ highly susceptible. All three pear accessions were highly susceptible. The inoculation tests revealed a wide range of virulence amongst New Zealand isolates of E. amylovora. Weakly virulent isolates were generally collected from ornamental and pear hosts, whereas isolates of high virulence were all collected from apple hosts. The findings from this study suggest that this may be the result of selection following host adaptation. | |
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