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Effects of rate and application method on the efficacy of metam sodium to reduce clubroot (Plasmodiophora brassicae) of canola

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Abstract

Clubroot, caused by Plasmodiophora brassicae, has become a serious threat to canola (Brassica napus) production in western Canada. Experiments were conducted to evaluate the effect of rate of metam sodium fumigant (dithiocarbamate; sodium N-methyldithiocarbamate; trade name Vapam) and application methods including watering, soil surface covering, and soil incorporation on clubroot of canola. At higher rates (0.4–1.6 mL−1 L soil) metam sodium increased canola seedling emergence and plant health, and reduced root hair infection, gall weight and clubroot severity under greenhouse conditions. Metam sodium application improved subsequent plant growth and reduced clubroot severity, but land preparation and volume of water applied did not affect efficacy. The incorporation of metam sodium into the soil and plastic covering after application improved fumigant efficacy. The study showed that soil fumigation with metam sodium can reduce clubroot severity and improve plant health in the subsequent canola crop.

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Acknowledgements

We thank the Canola Agronomic Research Program (Alberta Canola Producers Commission, SaskCanola, Manitoba Canola Growers Association, Canola Council of Canada), the Alberta Crop Industry Development Fund, and the Growing Forward 2 Program (Agriculture and Agri-Food Canada and Canola Council of Canada) for financial support of this research.

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Authors and Affiliations

  1. Crop Diversification Centre North, Alberta Agriculture and Rural Development (AARD), Edmonton, AB, T5Y 6H3, Canada

    S. F. Hwang, H. U. Ahmed, Q. Zhou, G. D. Turnbull & H. Fu

  2. Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, T6G 2P5, Canada

    S. E. Strelkov

  3. Agriculture and Agri-Food Canada Research Centre, Saskatoon, SK, S7N 0X2, Canada

    B. D. Gossen & G. Peng

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  1. S. F. Hwang
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  2. H. U. Ahmed
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  3. S. E. Strelkov
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  4. Q. Zhou
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  5. B. D. Gossen
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  6. G. Peng
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  7. G. D. Turnbull
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  8. H. Fu
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Correspondence to S. F. Hwang.

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Hwang, S.F., Ahmed, H.U., Strelkov, S.E. et al. Effects of rate and application method on the efficacy of metam sodium to reduce clubroot (Plasmodiophora brassicae) of canola. Eur J Plant Pathol 150, 341–349 (2018). https://doi.org/10.1007/s10658-017-1281-y

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