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Epidemiology and management of blackleg of canola in response to changing farming practices in Australia

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Abstract

The Australian canola industry was established in the 1970s and has expanded since that time, particularly in the last two decades. This review addresses the changes in farming practices since the year 2000 and the epidemiological and management consequences for blackleg, caused by the fungus Leptosphaeria maculans, the main disease impacting Brassica napus production. To help understand the change in production practices, a survey of over 100 growers and agronomists was conducted. Modern management practices include increased crop residue retention, frequency of canola in crop sequences, number of resistance genes in cultivars, use of hybrids and fungicides as well as earlier sowing and flowering times. While some of the changes identified in the survey and in this review increase the risk and severity of disease, including new symptoms like upper canopy infection, others provide novel strategies for control. Keeping these changes in mind, a set of research priorities towards long term sustainable management of blackleg disease are identified.

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Acknowledgements

We thank the participants of the survey and those that promoted participation, and John Kirkegaard for comments on the manuscript. This work was supported by the Australian Grains Research and Development Corporation (project UM00051) and Australian Research Council (LP170100548). We thank Andrew Ware, Kurt Lindbeck, Ravjit Khangura, Andrew Wherrett, Andrea Hills, Jenny Davidson and Vicki Elliott for help with collection of disease severity data between 2004 and 2020.

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  1. School of BioSciences, the University of Melbourne, Parkville, Victoria, 3010, Australia

    Angela P. Van de Wouw, Jack L. Scanlan, Peter A. Vesk & Alexander Idnurm

  2. Marcroft Grains Pathology, 110 Natimuk Road, Horsham, Victoria, 3400, Australia

    Stephen J. Marcroft

  3. CSIRO Agriculture and Food, GPO Box 1700, Canberra, ACT, 2601, Australia

    Susan J. Sprague

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  1. Angela P. Van de Wouw
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Correspondence to Angela P. Van de Wouw.

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Van de Wouw, A.P., Marcroft, S.J., Sprague, S.J. et al. Epidemiology and management of blackleg of canola in response to changing farming practices in Australia. Australasian Plant Pathol. 50, 137–149 (2021). https://doi.org/10.1007/s13313-020-00767-9

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