Resistance Management Strategy for:

Group 2             (Dicarboximide);

Group 3             (DMI);

Group 7             SDHI (Succinate dehydrogenase inhibitors)

Group 9             (Anilinopyrimidine);

Group 11            (Quinone outside Inhibitor) and:.

Group 11 + 3    (Quinone outside Inhibitor + DMI) treat as a Group 11 fungicide for resistance management purposes.
  1. Limit the use of Group 2, 3, 9 or 11 fungicides to periods when conditions favour disease development.
  2. DO NOT apply more than six Group 2 sprays in one season. Apply no more than two consecutive sprays of a Group 2
  3. DO NOT apply more than six Group 3 sprays in a season. Apply no more than two consecutive sprays of a Group 3 fungicide alone.
  4. If three or fewer fungicide sprays for target spot are applied per crop, use only one spray containing a Group 7 If four to six sprays are applied per crop, use a maximum of two sprays containing Group 7 fungicides.  If seven or more sprays are applied per crop use a maximum of three sprays containing Group 7 fungicides. If used solo, apply Group 7 fungicides in strict alternation with fungicides from a different cross resistance group. If fungicides containing Group 7 are used in mixture, apply a maximum of 2 consecutive applications.
  5. If three or fewer fungicide sprays for target spot are applied per crop, use only one spray containing a Group 9 If four to six sprays are applied per crop, use a maximum of two sprays containing Group 9 fungicides.  If seven or more sprays are applied per crop use a maximum of three sprays containing Group 9 fungicides.
  6. Apply no more than two consecutive sprays containing a Group 9 fungicide.
  7. Apply Group 11 containing fungicides preventively. DO NOT apply more than three foliar applications of a Group 11 containing fungicide per crop, no more than two consecutive Group11 sprays per crop.  If consecutive applications of Group 11 containing fungicides are used, then they must be followed by at least the same number of applications of fungicide(s) from a different group(s) before a Group 11 containing fungicide is used again, either in the current or following season.
  8. When using a Group 11 fungicide in-furrow at planting, use a fungicide from a different group as the first foliar spray.

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