Septoria carvi is an important pathogen of caraway. With the increasing occurrence of septoriosis of caraway during warm and humid growing seasons, the possibility of limiting the growth and development of the fungus was investigated. In vitro studies included 2 preparations of natural origin, ie Biosept Active, Beta-chikol and 12 fungicides from different chemical groups, as well as one isolate K 1806 S. carvi, obtained from caraway. Tests were performed by poisoning the culture media. The percentage of inhibition of the growth of four- and eight-day-old fungus colonies on the medium with preparations in comparison to the control colonies was a measure of the toxic activity of the preparations. The effectiveness of Beta-chikol in limiting S. carvi colony growth was significantly higher than the efficiency of Biosept Active. All tested fungicides limited the growth of the fungus colony and their inhibitory effect increased with the concentration of the active ingredient in the medium. The most effective preparation in vitro was Signum 33 WG, belonging to the strobilurin compounds. In vivo studies investigated the effect of Beta-chikol, Biosept Active and Dithane NeoTec 75 WG on the health of caraway plants. The occurrence of septoriosis was determined basing on the presence of disease symptoms and the mycological analysis of diseased plants. A significant reduction of septoriosis symptoms on plants and plant colonization by the fungus was caused by Biosept Active and Dithane NeoTec 75WG.
