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Brassica napus plants infected by Leptosphaeria maculans after the third to fifth leaf growth stage in south-eastern Australia do not develop blackleg stem canker

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Abstract

Blackleg (Phoma stem canker) caused by Leptosphaeria maculans is the most damaging disease of Brassica napus (canola, rapeseed, colza) worldwide and is controlled by sowing blackleg resistant cultivars and crop management strategies that reduce exposure to inoculum and fungicide application. In experiments in south-eastern Australia, canola cultivars inoculated after the three to five leaf growth stage did not develop stem canker. Although mature canola plants are known to be less susceptible to blackleg than seedlings, this highlights for the first time the specific importance of protecting seedlings up to the three to five leaf growth stage in Australia. This would typically correspond to a period of four to six weeks after emergence. Canola plants are likely to be significantly less vulnerable to infection after this growth stage. However, this timing may vary due to the influence of environmental conditions.

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Authors and Affiliations

  1. Department of Primary Industries, 3401, Horsham, Vic., Australia

    S.J. Marcroft & P.A. Salisbury

  2. Grains Innovation Park, Private Bag 260, 3401, Horsham, Vic., Australia

    S.J. Marcroft

  3. Discipline of Plant and Pest Science, The University of Adelaide, Waite Campus, 5064, Glen Osmond, SA, Australia

    M.R. Sosnowski & E.S. Scott

  4. South Australian Research and Development Institute (SARDI), GPO Box 397, 5001, SA, Australia

    M.R. Sosnowski & M.D. Ramsey

  5. Animal and Plant Control Commission, GPO Box 1671, 5001, SA, Australia

    M.D. Ramsey

  6. Institute of Land and Food Resources, The University of Melbourne, 3010, Vic., Australia

    P.A. Salisbury

  7. School of Botany, The University of Melbourne, 3010, Vic., Australia

    B.J. Howlett

Authors
  1. S.J. Marcroft
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  2. M.R. Sosnowski
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  3. E.S. Scott
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  4. M.D. Ramsey
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  5. P.A. Salisbury
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  6. B.J. Howlett
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Corresponding author

Correspondence to S.J. Marcroft.

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Marcroft, S., Sosnowski, M., Scott, E. et al. Brassica napus plants infected by Leptosphaeria maculans after the third to fifth leaf growth stage in south-eastern Australia do not develop blackleg stem canker. Eur J Plant Pathol 112, 289–292 (2005). https://doi.org/10.1007/s10658-005-1050-1

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  • DOI: https://doi.org/10.1007/s10658-005-1050-1

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