[Phytophthora: Think of the protection of potato tubers in time]

control de enfermedades crop yield cultivation cultivo disease control disease resistance encuestas evaluation experimentation ferme pilote fincas experimentales fongicide fungicidas fungicides papa pesticide pesticides phytophthora pilot farms plaguicidas plant production plant protection pomme de terre potatoes pourriture des racines pratique culturale protection des plantes rendement des cultures rendimiento de cultivos resistencia a la enfermedad root rots saxe-anhalt saxony-anhalt solanum tuberosum surveys tubercule tubers variedades varieties