 The study aimed to determine the level of carrot infection with sclerotinia sclatorium during storage and the potential controllability of polyversum WP containing ospores of pithium oligandrum. The results showed that sclerotium developed on carrots treated and untreated with polyversum WP, and the number of roots with sclerotium and degree of their infection increased with prolonged storage. However, analyses suggest that polyversum WP may potentially limit the growth of sclerotium. This article was authored by Anna Baturasisniuska, Alexander Lukinowski, Katerjina Kochvara, and others.