Lettuce – Botrytis, Sclerotinia

Crop(s): Lettuce

Pest(s): Botrytis, Sclerotinia

Resistance Management Strategy for:

Group 2 (dicarboximide)
Group 7 SDHI (Succinate dehydrogenase inhibitors)
Group 9 (anilinopyrimidine)
Group 11 QoI (Quinone outside inhibitor): and
Group 12 (phenylpyrroles) fungicides

  1. Apply Group 2 fungicide as a seedling drench soon after emergence.
  2. Apply a protectant fungicide as a high volume foliar spray before planting out, then a Group 2 fungicide immediately after planting.
  3. Maintain a cover with protectant fungicide sprays at 7-10 day intervals.
  4. If weather conditions favour Botrytis infection, tank mix the protectant with a Group 2 fungicide.
  5. DO NOT apply Group 2 fungicides more than four times per season, irrespective of the target disease.
  6. DO NOT apply more the two Group 9 or Group 12 fungicides per crop.
  7. DO NOT apply more than three Group 7 or Group 11 fungicides per crop and no more than two consecutive sprays per crop.

URL: https://croplife.org.au/resources/programs/resistance-management/lettuce-botrytis-sclerotinia/
Content last updated: July 2, 2019

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 27 June 2019. All previous versions of this strategy are now invalid.