Susceptibility of Gisela 5 and Maxma 14 cherry rootstocks to four Phytophthora species

Susceptibility of Gisela 5 and Maxma 14 cherry rootstocks to Phytophthora cactorum, P. citrophthora, P. citricola and P. parasitica was evaluated. All Phytophthora species were pathogenic to both of the cherry rootstocks tested. The level of susceptibility, however, varied according to Phytophthora species. P. citrophthora and P. parasitica isolates were the most virulent. P. citricola showed moderately virulence. The least virulence was shown from the P. cactorum isolates. Both rootstocks showed similar susceptibility.