[Symptoms and first diagnosis of grapevine yellows [Vitis vinifera L.; phytoplasmoses; bois noir; Veneto]]

adn damage danno diagnosi diagnosis diagnostic disease surveys dna electroforesis electrophoresis elettroforesi encuestas sanitarias enfermedades de las plantas fitoplasmas fitoplasmi fructification fruiting fruttificazione germogliazione indagini sulle malattie infection infezione maladie des plantes malattie delle piante monitoraggio monitoring pcr phytoplasmas phytoplasme plant diseases rflp sintomi sprouting surveillance symptome symptoms veneto vigilancia vitis vinifera