Ornamentals – Myrtle rust

Crop(s):          Ornamentals

Disease(s):     Grey mould (Botrytis)

Resistance Management Strategy for:

Group 3        Demethylation inhibitors (DMI);
Group 7        Succinate Dehydrogenase inhibitors (SDHI);;
Group 3+11  DMI + Quinone outside inhibitors (QoI); and
Group 11        QoI.

1. Fungicide groups that are classified as medium to high risk for fungicide resistance development, Group 3, 7 and 11 should be rotated as a key feature to reduce the development of resistance.
2. Do not apply more than two (2) consecutive sprays of fungicides from Group 3, 7 or 11, unless mixed with a registered fungicide from a different more of action group with no known resistance or low resistance risk.
3. If consecutive sprays of a Group 7 or 11, are applied, they must be followed by at least two applications of fungicide from a different group(s) before the same high-risk fungicide is used again.
4. 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.