| Summary: | <i>Pythium oligandrum</i> is an oomycete used in veterinary medicine to treat dermatophytosis in animals. The ovicidal potential against various types of parasite eggs has not been investigated. Ascarids are very common in young animals and the resistance of eggs in the external environment is very high. A commercial product containing <i>P. oligandrum</i> was used in the present study. Its ovicidal action against <i>Toxocara</i> spp. eggs was investigated. Thus, two categories of media (soil and sandstone) were used, on which the ascarid eggs were dispersed. The commercial product was prepared as a solution and was applied according to the manufacturer. The treatment scheme indicated in case of animals with dermatophytosis was used. Thus, the external natural conditions were recreated in the laboratory, in order to establish whether there is any applicability for this oomycete in the biological control of some parasitic diseases. The results indicated an ovicidal action of <i>Pythium oligandrum</i>, supporting the prospects of its use in the decontamination methods of various surfaces or environments where ascarid eggs from carnivores are found.
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