Volume 56 Number 3 Article 27
Year 2002 Month 7
Title: Incidence of Phytophthora cactorum Crown and Root Rot on Seven Apple Rootstocks Artificially Infected in the Orchard
Authors: R.S. Utkhede, A.H. Quamme and R. Brownlee
Abstract:
Seven apple rootstocks budded with 'Jonagold' scion were inoculated with Phytophthora cactorum
annually 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 crown and root rot.
The rootstock O. 3 was significantly less susceptible to P. cactorum infection compared with the MM.106 EM LA 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. cactorum in the orchard.
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