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In this study, the susceptibility of 7 commercially important sour cherry cultivars to Monilinia laxa was studied. Artificial inoculation was made with M. laxa isolates, which were isolated from different woody plants. Artificial inoculation was prepared in the laboratory and in the field. In laboratory, flowers of sour cherries while in the field, the two-year old twigs were inoculated in 2006 and 2007. According to results of stigmata inoculation, there were infection ability differences among the isolates originated from five different stone fruit host. Cultivars could be sorted into two susceptibility groups. In the field, twig inoculation in 2007 was made at blossom period and in 2007 at harvest. Seven sour cherry cultivars were inoculated with 8-day-old mycelial culture of M. laxa originated from sour cherry and almond. The agressivity and pathogenicity of the two isolates were measured by the degree of floem death: Results showed that year and phenological stage considerably influenced the degree of symptoms caused by the fungus. After artificial inoculation, tissue death progression was studied by fluorescent microscope. According to results, sour cherry cultivars were sorted into disease susceptibility groups. Susceptibility orders were identical to results on stigmata inoculation.

Cytosporal canker and dieback (Cytospora cincta Sacc.) is a widespread disease in apricot growing areas of Europe, excluding the Mediterranean. The pathogen attacks xylem and phloem. If the necrotic phloem completely girdles the branches or trunk, the section above the girdled region dies. When cambium necrosis does not girdle the branch or trunk, canker development ensues. Apricot trees are susceptible to Cytospora infection between July and the next bud opening.

Simultaneous inoculation with Pseudomonas syringae van Hall and Cytospora cincta Sacc. induced more extensive cankers than those caused by either pathogen alone. Freshly cut wounds remained susceptible to cytosporal infection for a longer period than to bacterial inoculation. Knowledge gained of the annual cycle of cytosporal and bacterial diseases offers possibilities for effective control against both pathogens.