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52-55.
Vol 6No 42000

A useful method was improved to test and to evaluate the susceptibility of plants to fire blight and the virulence of E. amylovora strains. Six Hungarian strains from different host plants were tested on in vitro cultured apple rootstocks. Disease rating was used for the characterization of the process of disease development. ...The different strains had different capacity to cause disease, mainly in the first period of incubation. There were significant differences between the virulence of the strains.

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