ISHS Acta Horticulturae 489: VIII International Workshop on Fire Blight
SUSCEPTIBILITY OF PRUNUS SPECIES TO ERWINIA AMYLOVORA |
| Authors: | S.K. Mohan, V.P. Bijman |
| Keywords: | Fire blight, stone fruits, plums, apricots |
| Abstract:
Susceptibility of selected cultivars of Prunus species to an isolate of Erwinia amylovora was evaluated under green house conditions. The isolates of E. amylovora from the Japanese plum (Prunus salicina) cv. Fortune and apple cv. Jonathan did not show significant virulence differences on cross-inoculation of young shoots. Spray inoculation of open blossoms of Japanese plum cvs. Fortune and Friar with the plum or apple isolate resulted in infection, with symptoms of browning and necrosis of the flower parts and abscission of infected blossoms, but infection did not progress into the spur. Results of inoculation of young leaves and shoot tips of selected cultivars of different stone fruit species and almond, with the plum isolate of E. amylovora under green house conditions revealed a wide range of reaction. In general, all the cultivars of Japanese plums and apricot (P. armeniaca) tested were susceptible. European plum/prune (P. domestica), peach (P. persica), nectarine (P. persica var. nucipersica) and sweet cherry (P. avium) cultivars, and almond (P. dulcis) showed very limited, resistant reaction. Sour cherry (P. cerasus) did not develop any symptom. | |
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