SEASONAL CHANGES IN THE EPIPHYTIC POPULATION OF ERWINIA AMYLOVORA ON APPLE AND PEAR

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Abstract
Erwinia amylovora (Burr.) Winsl. et al., the pathogen causing fireblight, was readily isolated from symptomless leaves in blocks of Lodi apple (Malus sylvestris Mill.), Bartlett pear (Pyrus communis L.) and a multicultivar pear block. The frequency of positive assays appeared to be related to the incidence of fireblight symptoms. However, the percent positive samples was highly variable, making prediction of blight outbreaks difficult. The bacterial population was highest from mid-July to the end of August. Before and after this period numbers of E. amylovora were relatively low. The pathogen was isolated from apparently healthy dormant buds of Lodi apple and Flemish Beauty pear.

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