Almonds – Blossom blight and brown rot

Crop(s):         Almonds

Disease(s):    Blossom blight and brown rot

Resistance Management Strategy for:

Group 2           Dicarboximides;
Group 3           Demethylation inhibitors (DMI);
Group 7           Succinate dehydrogenase inhibitors (SDHI);
Group 7+3     SDHI + DMI;
Group 11         Quinone outside inhibitors (QoI);
Group 11+3    QoI + DMI; and
Group 11+7    QoI + SDHI.

Maximum recommended number of sprays which can contain Group:



Total number of blossom blight/brown rot targeting sprays

2 3 7

(incl. 7+3 and 7+11)


(incl. 11+3 and 7+11)

1 1 1 1 1
2 2 2 1 1
3 2 2 1 2
4 2 2 1 2
5 2 2 1 2
6 3 3 2 2
7 3 3 2 2
8 3 3 2 2
9+ 3 3 3 3


  1. Do not apply consecutive sprays of products containing Group 7 or 11. Consecutive sprays include mixtures containing Group 7 or 11.
  2. Do not apply more than three Group 2 sprays in one season. Apply no more than two consecutive sprays before changing to another group.
  3. Consecutive application includes from the end of one season to the start of the following season.
  4. The spray program should be considered and the strategy applied on a whole-orchard basis.
  5. No specific resistance management strategy has been developed for low-risk fungicides, including those in Group M and BM. These products should be included in a management strategy as rotation and mixing partners as per label recommendations.

Content last updated: July 14, 2023

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 14 July 2023. All previous versions of this strategy are now invalid.