TY JOUR TI SPECIES COMPOSITION, PREVALENCE AND DANGEROUS DISEASES HARMFULNESS OF CEREAL CROPS IN SAMARA REGION AND THEIR DEVELOPMENT FORECAST KW wheat KW barley KW yield KW diseases KW harmfulness KW prevalence KW system JO Bulletin Samara State Agricultural Academy AU Nizharadze, T.S. PY 2018 IS 3 PB Samara State Agrarian University