Yield reduction caused by a soil-borne disease of naked, dwarf, and conventional oat in Finland

avena nuda avena sativa cereal crops crop yield cultivos de cereales dwarfs enano enfermedades fungosas finland finlande finlandia fungal diseases maladie fongique nain organisme transmissible par le sol organismos transmitidos por suelo pourriture des racines rendement des cultures rendimiento de cultivos root rots variedades varieties