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Published in Scientific Papers. Series B, Horticulture, Vol. LXVI, Issue 1
Written by Petko MINKOV, Boryana STEFANOVA, Georgi POPSKI, Silvena TODOROVA

The study was conducted in the period 2018-2020 on the territory of RIMSA Troyan with three cherry cultivars, such as 'Oblachinska’, 'Karneol’ and 'M 15’, grafted on 'Alkavo’ rootstock and planted in 2002 by trench method with local, stockpile organic fertilizing. The planting scheme was 4 x 3 m and they were grown under nonirrigated conditions. The reaction of the sour cherry cultivars, the intensity of the infestation and the manifestation of cylindrosporiosis and shot hole disease for the optimization of the schemes for sustainable Plant Protection under the climatic conditions of the Troyan region were studied. 'Karneol’ was found to have the lowest susceptibility to both diseases studied (shot hole disease <8.7%; white rust 21.3%). The average fruit weight was 5.5 g, it is suitable for fresh consumption, with an extremely balanced taste and with opportunities for organic and sustainable cultivation, and the later ripening period allows to extend the harvesting period. 'M15’ had a higher infestation index of Stigmina carpophila (Lev.) Ell (15.3%) compared to the other two cultivars and was more susceptible. Infestation index of Blumeriella jaapii (Rehm.) was slightly higher, but was well below 50%. It has attractive fruits with greater weight, bears abundant fruit and can be included in the cultivar list of modern sustainable technologies.

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