Seasonal variation in susceptibility of xylem tissue of Malus, Pyrus, Prunus, and Salix species to Chondrostereum purpureum in New Zealand

apples cell walls chondrostereum disease resistance durazno enfermedades de las plantas enfermedades fungosas fungal diseases maladie des plantes maladie fongique malus pumila manzana pared celular paroi cellulaire pathogens peaches pears pera plant diseases poire pomme prunus armeniaca prunus persica pyrus pyrifolia resistencia a la enfermedad salix seasonal variation taninos tannin tannins ultraestructura ultrastructure xilema xylem