Incidence of Phytophthora CactorumCrown and Root Rot on Seven Apple Rootstocks Artificially Infected in the Orchard
DOI:
https://doi.org/10.71318/apom.2002.56.3.168Abstract
Seven apple rootstocks budded with ‘Jonagold’ scion were inoculated with Phytophthora cactorumannually for four years and evaluated for susceptibility to this pathogen in orchard plots at the Pacific Agri-Food Research Centre at the end of the fourth growing season. No rootstock was observed to be completely resistant to P. cactorum crownand root rot. The rootstock O. 3 was significantly less susceptible to P. cactoruminfection compared with the MM.106 EMLA rootstock, which was the most susceptible. The rootstocks B. 9, J. 9, P. 2, M. 9 EMLA, and M. 26 EMLA were least susceptible to crown and root rot. This study indicated that it was possible to assess resistance to P. cactorumin the orchard.
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