TY JOUR TI To the problem of increasing stability of plantations of Voronezh upland oak forests KW forest pathology condition KW class of biological stability KW forest health KW resistance of stands KW degradation of forest environment KW pathological signs. JO Forestry Engineering Journal AU Furmenkova, E.S. AU Kochergina, M.V. AU Tregubov, O.V. PY 2015 IS 5 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov