The aim of the study was to assess the toxicity of azoxystrobin, a fungicide belonging to the strobilurin class, for selected saprophytic fungi (Saccharomyces cerevisiae and Penicillium sp.) and for radish (Raphanus sativus L.) The parameters of fungi growth and the early development stages of radish were analysed. Based on the sensitivity of the organisms and their physiological processes to azoxystrobin, they can be arranged in the following order: growth of sod1 S. cerevisiae mutant, growth of wild-type S. cerevisiae, growth of Penicillium sp., respiration of germinating radish seeds, early seed germination, elongation of roots and seedlings, late seed germination. The mechanism of azoxystrobin toxicity seems to be associated with cellular antioxidant status