Tomato – Powdery mildew

Crop(s):        Tomato

Disease(s):   Powdery mildew

Resistance management strategy for:

Group 3 Demethylation inhibitor (DMI);
Group 3+11 DMI + Quinone outside Inhibitor (QoI);
Group 7 Succinate dehydrogenase inhibitors (SDHI);
Group 7+3

Group 7+11



Group 13 Aza-naphthalenes.
Group 21 Quinone inside Inhibitor (QiI)


  1. Apply fungicides before disease becomes established.
  2. Do not apply more than four sprays of a Group 3 containing fungicide per crop.
  3. If applying Group 7, 11, 13 or 21 containing fungicides, do not apply more than two consecutive sprays before changing to another group. Do not apply more than three applications of a Group 7, 11, 13 or 21 containing fungicide per crop. If consecutive sprays are used, then use the same number of sprays of an alternative group before using another fungicide group, which includes sprays from consecutive crops.
  4. Group 7 and 21 containing product should not exceed thirty-three percent (33%) of the total sprays per crop. A maximum of five applications of Group 21 may be made per calendar year in case of multiple cropping cycles.

Content last updated: June 26, 2024

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 26 June 2024. All previous versions of this strategy are now invalid.