ISHS Acta Horticulturae 117: II Symposium on Fireblight
SEASONAL CHANGES OF EPIPHYTIC ERWINIA AMYLOVORA ON ORNAMENTALS IN RELATION TO WEATHER CONDITIONS AND THE COURSE OF INFECTION |
| Authors: | W. Brulez, W. Zeller |
| Abstract:
Studies on the epidemiology of fireblight on different ornamentals were carried out under natural infection conditions on the west coast of Schleswig-Holstein in the Fed. Rep. of Germany in 1979 and 1980. Some correlations between the weather conditions, the course of infection and the epiphytic populations of E. amylovora on apparently healthy leaves and blossoms of three species of Cotoneaster are discussed. The pathogen could be detected epiphytically on leaves of the highly susceptible Cotoneaster watereri during a period with temperatures under 15°C and 4 weeks before the first symptom expression. On the moderately susceptible C. dammeri var. radicans, however, colonies of E. amylovora could only be found sporadically and without a later expression of symptoms. | |
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