The state and prospects of using Central Russian bee colonies of the “Orlovsky” type N.N. Grankin, S.N. Bakina, A.P. Tyapkina, T.V. Fedyaeva and E.A. Fomina E3S Web Conf., 254 (2021) 01037 Published online: 05 May 2021 DOI: 10.1051/e3sconf/202125401037