Effect of a field-source mixture of citrus viroids on the perfomance of "Nules" clementine and "Navelina" sweet orange trees grafted on Carrizo Citrange - Bani-Hashemian, S. M.; Serra, P.; Barbosa, C. J.; Júarez, J.; Aleza, P.; Corvera, J. M.; Llich, A.; Pina, J. A.; Duran-Vila, N.