Secondary screening of strains of antagonists to a Phoma pathogen on sunflower Lyubov Maslienko, Aliya Voronkova, Lyubov Datsenko, Evgeniya Efimtseva and Daria Punogina BIO Web Conf., 21 (2020) 00017 Published online: 22 June 2020 DOI: 10.1051/bioconf/20202100017