Abstract
Diagnostic and pathogenicity tests of two isolates of bacteria from blighted pear trees in Turkey were compared with tests of known isolates of Erwinia amylovora. Turkish isolates formed orange-yellow colonies with deep orange centers and clear margins on modified Miller-Schroth medium; they did not fluoresce under ultraviolet light when grown on King's medium B. Bacterial ooze was produced on immature pear fruit, and susceptible pear shoots were blighted in 6 days. Based on these tests, the two Turkish isolates were positively identified as Erwinia amylovara (.)
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