Stone fruit – Blossom Blight, Brown Rot

Crop(s): Stone fruit

Pest(s): Blossom Blight, Brown Rot

Resistance Management Strategy for:

Group 2           (Dicarboximide);
Group 3           DMI (Demethylation Inhibitor);
Group 7           SDHI (Succinate dehydrogenase inhibitors);
Group 9           (Anilinopyrimidine) fungicides; and
Group 11          QoI (Quinone outside Inhibitor).

  1. If applying Group 2, 3, 7 or 7+11 fungicides, DO NOT apply more than two consecutive sprays of fungicides from the same group before changing to another group, this includes application made from one season to the next.
  2. DO NOT apply more than three sprays of a Group 7, 9, 11 or 7+11 fungicide per season.
  3. If consecutive sprays of fungicides from the same chemical group are applied, they must be followed by at least the same number of sprays from an alternative chemical group, before returning to the original group.
  4. A post-harvest treatment should also be counted as an application.
  5. The last blossom blight spray and the first pre-harvest brown rot spray should be regarded as consecutive applications.
  6. The spray program should be considered and the strategy applied on a whole-orchard basis.
Maximum number of consecutive sprays when applied alone222222
Maximum number of consecutive sprays when applied in mix with a different mode of action222222
Maximum number of sprays per season333333

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.