The paper shows the first study on the effect of nanoparticles against fungal pathogens of caraway. The fertilizers containing nanoparticles of copper, silver, and chitosan: Viflo® copper, Viflo Chitosol® Silver® Viflo Cal S and isolates KLM 1806 and KLM 1813 of Septoria carvi were used to the study. The percent of growth inhibition, development of S. carvi colonies and ability of Viflo® Cal to control plants against infection by S. carvi was adopted as the criterion of evaluation of the nanoformulations. The field experiment evaluated the effect of Viflo® Cal S to plant health in terms of the occurrence of S. carvi and Erysiphe heraclei, colonization of plant tissues by S. carvi and the yield of schizocarps. In vitro it has been shown that the tested formulations with nanoparticles limited the growth and development of the S. carvi and Viflo Cal® S at the concentration of 1 g·cm^-3 was the inhibitor of mycelial growth. In climatic chamber Viflo Cal® S protect caraway’s seedlings against the infection by S. carvi. In vivo Viflo Cal S® significantly limited the severity of septoriosis and powdery mildew, which contributed to increase the size and quality of the caraway crop.

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