In 2011 was conducted experimental plantings on land ZF Mendelu in the Lednice for determining the relative resistance of selected varieties of apricots, and to determine the potential substances to enhance resistance to P. syringae pv. syringae. The varieties were inoculated with strains FN3, Lmg1247 and CCM4073. In 2013 and 2014 were observed selected symptoms on plants, which was determined the level of relative resistance of each variety. As resistant varieties were determined 'Kuresia', 'Orangered', 'Bergeval' and 'Bergarouge'. As moderately susceptible varieties were determined 'Tardicot', 'Leskora', 'Aurora', 'Harogem', 'Pinkcot' and 'Sylvercot' on rootstock 'Waxva'. As susceptible varieties were determined 'Goldrich', 'Kioto', 'Bergeron' and 'Sylvercot' on rootstock 'Rubira'.