Ahmed, H. U., Hwang, S. F., Strelkov, S. E., Gossen, B. D., Peng, G., Howard, R. J. and Turnbull, G. D. 2011. Assessment of bait crops to reduce inoculum of clubroot (Plasmodiophora brassicae) of canola. Can. J. Plant Sci. 91: 545-551. Clubroot, caused by Plasmodiophora brassicae, is a serious threat to canola (Brassica napus, B. rapa) production in western Canada because of its long-lived resting spores, high spore production potential, and negative impact on seed yield when inoculum concentrations are high. The impact of bait crops on soil resting spore populations and subsequent clubroot severity was studied in replicated trials under greenhouse and field conditions. Resting spore populations were often slightly reduced following two cycles of cruciferous crops (canola or Chinese cabbage) relative to non-cruciferous host crops (red clover, perennial ryegrass, orchardgrass, bentgrass) and non-host crops (barley, wheat). Subsequent clubroot severity showed a similar trend, but the impact was generally small and inconsistent. Bait crops had no effect on clubroot severity at two commercial field sites where populations of resting spores were high (1 × 106 spores per gram of soil). We conclude that the use of bait crops is unlikely to be an important component of an IPM program for clubroot of canola.
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Vol. 91 • No. 3