Resistance Management Strategy for:

Group 3 (DMI);

Group 7 SDHI (Succinate dehydrogenase inhibitors) and

Group 11 (Quinone outside Inhibitor) fungicides

    1. Apply a program of protectant fungicides from early crop establishment and maintain a regular spray program throughout the crop growing cycle. If weather conditions favour powdery mildew development, use a Group 3 or Group 11 fungicide.

    2. DO NOT apply more than four Group 3 sprays per season. DO NOT apply more than two consecutive sprays of Group 3 fungicides, including from one season to the next.

    3. If applying Group 7 fungicides, DO NOT apply more than two consecutive sprays before changing to another group.

    4. DO NOT apply more than three Group 7 sprays per season.  If consecutive sprays are used, then use the same number of sprays of an alternative group before using another Group 7, including sprays in consecutive seasons.

    5. Apply Group 11 fungicides preventively. DO NOT apply consecutive sprays of Group 11 fungicides, including from one season to the next.

    6. If three or fewer powdery mildew fungicide sprays are applied per crop, use only one spray containing a Group 11 fungicide.  If four to six sprays are applied per crop, use no more than two sprays containing a Group 11 fungicide.  If seven or more sprays are applied per crop use a maximum of three sprays containing a Group 11 fungicide. DO NOT apply more than three Group 11 sprays per season.

    7. DO NOT use Group 3 fungicides curatively.


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 www.apvma.gov.au