Lettuce – Botrytis and Sclerotinia

Resistance management strategy for:

Guidelines

1. Not all listed products are registered for both diseases. Ensure the product is registered for the disease being targeted.
2. Maintain a cover with protectant fungicide sprays at seven to ten day intervals from planting.
3. Do not apply Group 2 fungicides more than four times per season, irrespective of the target disease.
4. Do not apply more than two fungicides containing Group 9 per crop (including Group 9+12).
5. Do not apply more than three Group 7, Group 11, or Group 21 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.
6. Group 7 and Group 21 containing sprays should not make up more than one in every three of the spray program.
7. Do not apply more than two consecutive applications of a Group 12 containing fungicide.
8. Apply Group 21 as a protectant spray only. Continue alternation of fungicides between successive crops. Do not apply more than five (5) applications of Group 21 per year on the same area.