Fig. 1

Mean virulence rating of E. amylovora 650 strain used for inoculation of actively growing shoots of three apple cultivars of different susceptibility. Virulence was measured 6 weeks post-inoculation and it is expressed as a percent of the length of a shoot exhibiting necrosis divided by the entire length of shoot. Mean virulence ratings were separated with Tukey’s test at a significance level of P = 0.05. The vertical bars represent standard error