RESEARCH REGARDING THE INTRODUCTION INTO CULTIVATION OF CHERRY CULTIVAR RESISTANT TO CHERRY LEAF SPOT (BLUMERIELLA JAAPII) PUBLISHEDSNEJANA DAMIANOV
Abstract Cherry leaf spot (Blumeriella jaapii HIGG. syn Coccomyces hiemalis) produces considerable damage in young plantations of fructifying cherry trees. The pathogen attacks the leaves and, under proper conditions, even fruit and shoots. The symptoms characteristic to the attack are the appearance of 1 – 3 cm purple – reddish spots on the upper side of the leaves, spots that often unite covering large areas of the leaves of even the entire leaf. On the other side of the leaves, there are white-pinkish spots containing white-pinkish pustules (acervules). As a result, the leaves start to dry and fall prematurely. Research regarding the introduction and extension of the cultivation of cherry trees of some cultivars resistant to cherry leaf spot was carried aut in the Lugos cheery tree plantation (Far, no. 4) of the Teaching and Experimental Station of the Banat’s University fo Agricultural Sciences and Veterinary Medicine „King Michael I” from Timisoara. Te cherry tree cultivars we studied were: Van, Germersdorf, Bing, Rubin, Stella. In each cultivar, starting with the end of May, when there was maximum attack by cherry leaf spot (reddish spotting) we monitored 900 leaves on 3 branches differently set in the fruit tree canopy, noting the frequency, intensity and attack degree in 3 cherry trees from each cultivar monitored. In the cherry tree plantation, we applied, upon warning during vegetation 4 phyto – sanitary treatments using fungicides and insecticides. The observation of the behaviour to the attack by cherry leaf spot (Blumeriella jaapii) allowed us to group the cherry trees into: slightly attacked (Seneca, Cerna, Ulster); medium attacked (Timpurii de mai, Roşii de Bistriţa); strongly attacked (Van, Bing, Germersdorf). We recommend the extension of the cultivation of the cherry tree in south – western Romania.
Key words: cherry leaf spot, cherry tree, frequency, attack degree, cultivar