Survey of eastern Ontario alfalfa fields to determine common fungal diseases and predominant soil-borne species of Pythium and Fusarium

champignon colletotrichum colletotrichum trifolii enfermedades fungosas fungi fusarium fusarium equiseti fusarium oxysporum medicago sativa mycose mycoses organisme transmissible par le sol organismos transmitidos por suelo peronospora phoma medicaginis pleospora herbarum pseudopeziza pythium pythium irregulare sclerotinia sclerotinia trifoliorum soil sol suelo