HOST-PATHOGEN INTERACTIONS OF ERWINIA AMYLOVORA ON APPLE AND PEAR IN NEW ZEALAND
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.
Taylor, R.K., Ranatunga, C., Bus, V. and Alspach, P.A. (2002). HOST-PATHOGEN INTERACTIONS OF ERWINIA AMYLOVORA ON APPLE AND PEAR IN NEW ZEALAND. Acta Hortic. 590, 363-367
fire blight, Erwinia amylovora, phenotyping, host-pathogen interactions