The effects of soil amendments and inoculation timing on the development of clubroot (Plasmodiophora brassicae)

Boron reduced clubroot severity at relatively high rates. However, determining how boron suppresses clubroot was inconclusive. An experimental biofumigant was evaluated and was not effective against clubroot.

Induced resistance / susceptibility was investigated using the reaction to avirulent / virulent pathotypes on split-root plants. Inoculation on one side of the split-root system did not induce a resistant or susceptible reaction on the other side when inoculated with the alternative pathotype. Based on the results of these studies, lime is the best option to include in a management system for clubroot in canola.