[New American rootstocks resistance to nematodes]

arricciamenti fogliari clone clones cloni disease resistance enroulement des feuilles fitomejoramiento grapevines hybride hybrids ibridi leaf curls meloidogyne miglioramento genetico vegetale necrose necrosi necrosis plant breeding portainjertos porte greffe portinnesti racine radici resistencia a la enfermedad resistenza alle malattie rizado de la hoja roots rootstocks vid vigne xilema xylem