[Fungal diseases of oilseed rape in Switzerland: diagnosis, occurence, conditions for development, incidence on rape varieties]

alternaria botrytis brassica napus cankers chancre enfermedades de las plantas enfermedades fungosas fungal diseases maladie des plantes maladie fongique moho moisissure moulds necrosis cancerosa peronospora plant diseases plasmodiophora podredumbres pourriture pseudocercosporella rots suisse suiza switzerland variedades varieties