Resistance Management Strategy for:

 Group 4            (Phenylamide);

Group 11           (Quinone outside Inhibitor);

Group 28 + 43      (Carbamate plus Benzamide);

Group 40          (Carboxylic acid amide); and

Group 49       OSBP (Oxysterol binding protein inhibitor) fungicides.

  1. Start disease control early and maintain a regular protectant program. Fungicide applications need to start before the 6 leaf stage for early season control to be effective.
  2. When conditions favour disease development (high humidity, still weather, overcast skies), prior to visible disease symptoms (white downy growth on the underside of lower leaves followed by brown angular lesions) apply a single spray of a Group 49 fungicide, or up to two consecutive sprays of a Group 4, 11, 40 or 28 + 43 product (including mixtures containing Group 4, 11 or 40), at the interval recommended on the label. Then resume the program of sprays using products from a different group to the Group 4, 11, 40, 49 or 28 + 43 products just applied.
  3. DO NOT apply more than two sprays per season of a product containing a Group 4, 11 or 40 fungicide. DO NOT apply more than one spray of a product containing a Group 49 fungicide per season and ensure this does not exceed 33% of the of the total number of fungicide sprays per season.
  4. DO NOT apply more than three sprays of a Group 28+43 product per crop
  5. Apply Group 11 fungicides preventatively.
  6. Apply Group 4 and 49 fungicides preventatively and only in mixtures with effective protectant fungicide from a different mode of action group.
  7. DO NOT use a Group 49 product if it will be the last fungicide applied to the crop.

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