This diploma thesis deals with the most significant fungal pathogens Podosphaera mors-uvae, Cronartium ribicola and Drepanopeziza ribis, which can be commonly identified on currants and gooseberries in our climatic conditions. There are descriptions of various pathogens, how they spread and survive throughout the year, preventive defence and possibilities of curative chemical defence are also introduced. The state of attack of the plants by pathogens was monitored and evaluated. 10 cultivars of currants and 10 cultivars of gooseberries were used for this experiment. The most significant occurrence of P. mors-uvae on annual shoots and on fruit was noticed on gooseberry cultivars 'Terno', 'Golden fig', 'Neguš' and 'Industrie' and on currant cultivars 'Favorit' and 'Junifer'. On the other hand, gooseberry cultivars 'Kaptivátor' and 'Prima' and currant cultivars 'Titania' and 'Detvan' were not attacked. The heaviest occurrence of C. ribicola was recorded on gooseberry cultivar 'Karát', 'Kaptivátor' and 'Karmen' which were defoliated as a result of the pathogen attack. From currants, the heaviest attack was noted on cultivars 'Othelo', 'Titania' and 'Nigra'. The occurrence of D. ribis was slightly noticable on gooseberry cultivars 'Karmen', 'Karát', 'Prima' and 'Invicta'. In terms of currants, the most severe occurrence was logged on cultivar 'Jonkher van Tets'.