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Effects of post-application land treatment on the efficacy of Vapam to control clubroot (Plasmodiophora brassicae) of canola.

Hwang, S.F., Ahmed, H.U., Zhou, Q., Strelkov, S.E., Gossen, B.D., Peng, G., and Turnbull, G.D. 2016. Effects of post-application land treatment on the efficacy of Vapam to control clubroot (Plasmodiophora brassicae) of canola. Can. J. Plant Pathol. 38: 266.

Abstract

Clubroot, caused by Plasmodiophora brassicae Woronin, has become a serious threat to canola (Brassica napus L.) production in western Canada. The efficacy of Vapam (metam sodium) for the control of clubroot in Brassica vegetable crops has been variable, reflecting different application methods and post-fumigation land treatment. Experiments were carried out to evaluate the effects of the amount of watering, soil incorporation and tarping on the efficacy of Vapam fumigant in reducing clubroot severity in P. brassicae-infested soils. Levels of watering or watering + plastic tarping did not affect the efficacy of Vapam, but, compared with the non-treated control, Vapam fumigation improved seedling emergence, plant growth, plant biomass, pod number and seed yield, and reduced gall weight and clubroot severity. Post-application incorporation of Vapam into the soil improved plant biomass and seed yield, and reduced clubroot severity compared with a non-incorporated control. Covering the treated soil with a plastic tarp after Vapam fumigation significantly improved seedling emergence, plant vigor and reduced gall weight and clubroot severity compared with non-treated plots covered with plastic. A 12-day duration of covering increased emergence and yield compared with a 7- or 16-day covering duration. In summary, soil incorporation and tarping of the land after application increased the effectiveness of Vapam in controlling clubroot.

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