[The integratet plant protection in sugar beet cropping. Purposive control of Cercospora beticola in sugar beets based on threshold values]

beta vulgaris cercospora beticola cercosporiose control de enfermedades decision making diagnosis diagnostic disease control erysiphe betae fongicide fungicidas fungicides integrated plant production modele modelos models pseudomonas syringae ramularia toma de decisiones