EN
The fire blight bacterium - Erwinia amylovora - was spread to over 40 countries during last 200 years, since it was f or the first time reported on the eastern sea-coast of USA. The main role in dissemination of this pathogen on a long distance play the propagating material and also migratory birds. However, short distance spread of E. amylovora is mainly supported by the insects and weather conditions, such as rain and wind. The list of arthropods associated with fire blight dissemination includes different species of insects and mites, belonging to nearly 80 genera. Some of them carry pathogen on the surface of their body, while the others create infection courts by wounding plants. In early spring the flies (Diptera) feed on bacterial oozes, which appear on the surface of holdover cankers, became contaminated with E. amylovora and could transfer this pathogen to blossoms. Nevertheless, during blossom the main role in fire bight dissemination play the honeybees (Apis mellifera), carrying bacteria from flower to flower. E. amylovora, however, couldn't survive the winter inside beehives, so bee colonies are not considered as a potential source of primary inoculum. After bloom sucking the insects, especially aphids (Aphididae), leafhoppers (Jassidae), psyllas (Psyllidae) and plant bugs (Lygus spp.), injuring plants create infection courts for bacteria spread by the weather conditions. They also contact with E. amylovora feeding on infected shoots and then could transfer pathogen, on or inside their bodes, to the healthy shoots or plants, but efficiency of this way of infection is controversial.