Disease(s): Scald and Net blotch
Resistance Management Strategy for:
Group 3 Demethylation Inhibitors (DMI);
Group 7 Succinate dehydrogenase (SDHI);
Group 7 + 3 SDHI + DMI;
Group 11 + 3 Quinone outside Inhibitor (QoI) + DMI;
Group 11 + 4 QoI + phenylamide; and
Group 11+7+3 QoI + SDHI + DMI
- Fungicides should be used as protectant treatments – where there is no more than 5% leaf area infection evident anywhere in the canopy. In high risk disease environments, integrated management approaches should be used to reduce fungicide resistance risk, which may include:
- removal of stubble,
- crop rotation (avoid barley on barley),
- control of green bridge volunteers; and
- the use of tolerant and resistant varieties.
- DO NOT apply more than one application of a Group 7 seed treatment with foliar activity in any two consecutive growing seasons.
- DO NOT apply more than two applications per growing season of Group 11 or 7 containing products. This includes foliar sprays as well as in-furrow or seed treatments that have activity on foliar diseases. Combinations of in-furrow and seed treatment are counted as one application.
- DO NOT apply consecutive applications of Group 11 containing products. This includes in-furrow i.e. if a Group 11 + 4 or 11+7+3 fungicide has been used in-furrow at planting, the first foliar fungicide spray must not contain a Group 11 fungicide
- If a Group 7 seed treatment has been used with foliar activity (as determined by label claims), the first foliar fungicide applied should not contain a Group 7 fungicide.
- If a Group 7 fungicide is being applied as a foliar spray, it must be in a coformulation or in mixture with a registered mixing partner with a different mode of action, with no known resistance.
- DO NOT apply more than three applications containing Group 3 fungicides per growing season. This total of three applications includes DMIs applied as Group 11 + 3 or Group 11+7+3 co-formulations and in-furrow or seed treatments that have activity on foliar diseases. Combinations of in‑furrow and seed treatments are counted as one application.
- Minimise use of Group 3 fungicides which are known to have compromised resistance status.
NET BLOTCH ON YORKE PENINSULA, SOUTH AUSTRALIA
- Minimise use of Group 7 fungicides with foliar activity where resistance has been confirmed.
- Minimise the use of Group 7 fungicides (seed treatments and foliar sprays) to high-risk crop varieties.
- Group 7 fungicides should not comprise more than 50% of the total number of fungicide applications targeting this disease, which includes seed treatments with foliar activity and foliar sprays per season.