Canola – Blackleg

Crop(s):  Canola

Pest(s): Blackleg

Resistance Management Strategy for:
Group 3               DMI (Demethylation Inhibitor);
Group 7               SDHI (Succinate dehydrogenase Inhibitors); and
Group 7+3          (SDHI + DMI).

  1. Fungicides should be used as preventatively as possible or at first sign of disease. If disease is established within the canopy, fungicides may not produce optimal results and there is very strong potential to select for fungicide resistance.
  2. In high risk disease environments, integrated management approaches should be used to reduce fungicide resistance risk including growing canola at least 500 m from previous seasons canola stubble, the use of resistant varieties, using alternative fungicide modes of action and stubble management such as knocking down and/or strategic burning.
  3. The risk of developing resistance to fungicides can be reduced by incorporating different modes of action into blackleg management programs as either mixtures, co-formulations or rotations.
  4. If a Group 7 seed treatment has been used with foliar activity on blackleg (as determined by label claims), the seedling fungicide application at 4-6 leaf stage targeting blackleg should not contain a Group 7 fungicide.
  5. DO NOT apply more than two applications containing Group 7 fungicides per growing season when targeting blackleg. Combinations of in furrow and seed treatment are counted as one application.
  6. Minimise use of fungicides which are known to have compromised resistance status.
Growth stageRotation examples
Seedling3, 7 or 7+333None

Content last updated: July 2, 2019

CropLife Australia’s Resistance Management Strategies provide a guide for crop protection product rotation through product groups. The strategies are a useful tool that supports farmers’ adoption of resistance management. All crop protection products must be handled and applied strictly as specified on the product label or APVMA permits.

These Resistance Management Strategies do not replace product labels. They are a guide only and do not endorse particular products, groups of products or cultural methods in terms of their performance. It is important to check with the Australian regulator’s (APVMA) product database for contemporary information on products and active constituents. The database can be sourced through

The information given in this strategy is provided in good faith and without any liability for loss or damage suffered as a result of its application and use. Advice given in this strategy is valid as at 27 June 2019. All previous versions of this strategy are now invalid.