Le syndrome des basses richesses: Is it a threat to the UK sugar beet crop?

beta vulgaris cicadelloidea enfermedades de las plantas enfermedades fungosas fungal diseases insecte nuisible maladie des plantes maladie fongique necrose necrosis pathogens pest insects pests of plants phytoplasmas plagas de plantas plant diseases ravageur des plantes remolacha azucarera sucre sugar sugar beet symptome symptoms vecteur de maladie vectores vectors weather