[The control of grape downy mildew in Valle d'Aosta [Plasmopara viticola - Vitis vinifera]]

agricultural warning services application date avertissement agricole chemical control control de enfermedades controllo delle malattie damage danno date d'application disease control disease surveys encuestas sanitarias enfermedades fungosas environmental factors epidemiologia epidemiologie epidemiology epoca di trattamento extension extension activities facteur du milieu factores ambientales fattori ambientali fongicide fungal diseases fungicidas fungicides fungicidi highlands indagini sulle malattie lutte chimique maladie fongique malattie fungine peronospora plant protection protection des plantes servizi di allarme agricoli val d'aoste valle d'aosta valle de aosta vitis vinifera vulgarisation