Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Identification and spread of Erwinia amylovora on pear in Turkey.

Abstract

Diagnostic and pathogenicity tests of 2 isolates of bacteria from blighted pear trees in Turkey were compared with tests of known isolates of E. amylovora. The Turkish isolates formed orange-yellow colonies with deep orange centres and clear margins on modified Miller-Schroth medium; they did not fluoresce under UV light when grown on King's medium B. Bacterial ooze was produced on immature pear fruit, and susceptible pear shoots were blighted in 6 d. Based on these tests, the 2 Turkish isolates were positively identified as E. amylovora. It is suggested from the the pattern of spread of fire blight in the Middle East, the Balkans and the Mediterranean area since 1982, that the infections in Turkey may be part of an expanding epidemic originating in Egypt.