Lettuce – Botrytis and Sclerotinia

Crop(s):          Lettuce

Disease(s):     Botrytis and Sclerotinia

Resistance Management Strategy for:

Group 2          Dicarboximides; 
Group 7          Succinate dehydrogenase inhibitors (SDHI);
Group 7+11    SDHI + Demethylation inhibitors (DMI);
Group 7+12    SDHI + phenylpyrroles (PP);

Group 9          Anilinopyrimidines (AP);
Group 11        Quinone outside inhibitors (QoI); and
Group 9+12    AP + PP.

  1. Maintain a cover with protectant fungicide sprays at 7-10 day intervals from planting.
  2. Do not apply Group 2 fungicides more than four times per season, irrespective of the target disease.
  3. Do not apply more than two fungicides containing Group 9 per crop (including Group 9+12).
  4. Do not apply more than three Group 7 or Group 11 containing fungicides per crop and no more than two consecutive sprays per crop. If a Group 7 or 11 fungicide has been used solo it should be in strict alternation with other modes of action. If used in a mixture, no more than two consecutive sprays per crop. This includes the treatment at the end of one crop and the start of the next as consecutive.
  5. Do not apply more than two consecutive applications of a Group 12 containing fungicide.
  6. 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 per label recommendations.

URL: https://croplife.org.au/resources/programs/resistance-management/lettuce-botrytis-sclerotinia-draft/
Content last updated: July 16, 2021

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 16 July 2021. All previous versions of this strategy are now invalid.