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Clubroot, caused by  Plasmodiophora brassicae , is a major disease of canola ( Brassica napus ). This study evaluated the effect of clubroot development on the yield of this crop under field and greenhouse conditions. Three canola cultivars, ‘45H31’ (susceptible), ‘45H29’ (1st-generation resistance) and ‘CS2000’ (2nd-generation resistance), were inoculated with different quantities of  P. brassicae  inoculum and monitored for yield, pods per plant and 1000-grain weight. The field experiment was conducted over 2 years in biosecure clubroot nurseries inoculated with pathotype 5X or a mix of pathotypes 5X and 3H at 5 × 10 4 , 5 × 10 6  and 5 × 10 8  resting spores per plant. In the greenhouse experiment, plants were inoculated with pathotypes 5X, 3H or a mixture of both at 1 × 10 3 , 1 × 10 4  and 1 × 10 6  resting spores per plant. In both the field and greenhouse, clubroot incidence and disease severity index (DSI) increased along with inoculum concentration; the highest levels of disease were observed in the susceptible cultivar, while the lowest levels were found in ‘45H29.’ Yield, pods per plant and 1000-grain weight decreased as the DSI increased in all cultivars. Yield was affected by DSI and cultivar but not pathotype. Regression analysis indicated that under greenhouse conditions, an increment of 1% in DSI resulted in a decrease of 0.49% in yield; under field conditions, this percentage was reduced to 0.26%. While the rate of yield reduction was similar among cultivars, overall yield loss was lower in the resistant hosts, as they developed less disease.

Effect of clubroot ( Plasmodiophora brassicae ) on yield of canola ( Brassica napus )