Chemical Protection of Apple Against Leaf Powdery Mildew and Sustainability to Pathogen Cultivars According to EU Standards

The main goal of this research has been to investigate the efficiency of chemical preparations and their sustainability of apple cultivars against powdery mildew pathogen (Podosphaeraleucotricha) .Three cultivars of apple (Jonathan, Idared and Vizajka-native cultivars) have been tested in experimental fields (in the municipality of Peja, Kosovo) during the two years of research (2013 - 2014) .Fungicides that are used were: Webeton (triadimefon), Rubigan (fenarimol), Karathan EC (dinocap) and Kossan WG (sulfur). During the vegetation has been made eight spraying, three spraying before the blossoming and five spraying after the blossoming, within a period of 10-15 days between spraying and sprinkling. After that, there have been done three evaluations of the disease and the results obtained have been processed according to Mc Kinney index. Through the processed results has been seen that higher efficiency of chemical preparations has been in the Webeton and Karathan combination EC (variant - B2) and in Rubigan and Karathan combination EC (variant - B1), during the two years of the research. Whereas, regarding the suitability of cultivars to pathogen, cultivar “Vizajka†(native cultivar) showed the highest sustainability against disease pathogen, where, the index in the first and second year of the research has been lower in all variants as well as to control compared to two other cultivars. While, the most sensitive cultivar against powdery mildew pathogen was Jonathan with the higher disease index compared with two other cultivars.