Diffusion of Phomopsis mali causing dieback of young apple trees in Trentino [Malus pumila L.]

aetiology cancri cankers chancre chlorose chlorosis clorosi clorosis cold disease surveys drought stress encuestas sanitarias enfermedades fungosas environmental factors epidemiologia epidemiologie epidemiology etiologia etiologie experimental infection eziologia facteur du milieu factores ambientales fattori ambientali freddo frio froid fungal diseases humedad relativa identification identificazione indagini sulle malattie infezione sperimentale maladie fongique malattie fungine malus pumila marciumi mortalidad mortalite mortality necrosis cancerosa pathogenicity patogenicidad phomopsis podredumbres pourriture relative humidity rots sintomi symptome symptoms