Investigation on resistance to leaf spot disease (Blumeriella jaapii) in cherries

An artificial inoculation test method with leaf disks was established in the laboratory. The resistance to leaf spot of 51 sour cherry cultivars, 7 sweet cherry cultivars and 11 Prunus species was evaluated in lab tests. In result of these resistant screening tests, 8 sour cherry cultivars showed a resistant reaction to leaf spot. All tested sweet cherry cultivars were susceptible. The tested Prunus species, P. sargentii, P. serrulata var. spontanea, P. subhirtella pendula rosea, P. incisa, P. canescens, P. kurilensis, P. nipponica, P. maackii showed a resistant reaction type to the leaf spot fungus. P. dawyckensis was susceptible.