Poppies – Downy mildew

Crop(s):          Poppies

Disease(s):     Downy mildew

Resistance management strategy for:

Group 4 Phenylamides (PA);
Group 11 Quinone outside inhibitors (QoI);
Group 28+43 Carbamates + benzamides;
Group 40 Carboxylic acid amides (CAA);
Group 45+40 Quinone outside inhibitors, stigmatellin binding type (QoSI) + CAA;
Group 49 Oxysterol binding protein inhibitors (OSBPI); and
Group 49+11 OSBPI + QoI.


  1. Start disease control early and maintain a regular protectant program. Fungicide applications need to start before the 6-leaf stage for early season control to be effective.
  2. When conditions favour disease development (high humidity, still weather, overcast skies), prior to visible disease symptoms (white downy growth on the underside of lower leaves followed by brown angular lesions) apply a single spray of a Group 49 containing fungicide, or up to two consecutive sprays of a Group 4, 11, 40 or 28+43 product (including mixtures containing Group 4, 11 or 40), at the interval recommended on the label. Then resume the program of sprays using products from a different group to the products just applied.
  3. Do not apply more than two sprays per season of a product containing a Group 4, 11, 40 (including 45+40) or 49+11 Group 49 containing sprays should not exceed one in every three sprays of the total number of fungicide sprays per season.
  4. Do not apply more than three sprays of a Group 28+43 product per crop.
  5. Apply Group 11, 45+40 and Group 49+11 fungicides preventatively.
  6. Apply Group 4 and 49 fungicides preventatively and only in mixtures with an effective protectant fungicide from a different mode of action group.
  7. Do not use a Group 49 (or 49+11) product if it will be the last fungicide applied to the crop.


4 11 28+43 40, 45+40 49, 49+11
Maximum number of consecutive applications 2 2 2 2 1
Maximum number of solo sprays None       None of 49
Maximum number of sprays per crop or season * 2 2 3 2 2

(or 1 in 3)


* Maximum application number on product label may differ. Ensure you follow the label recommendations

URL: https://croplife.org.au/resources/programs/resistance-management/poppies-downy-mildew-3/
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 www.apvma.gov.au

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.