Barley – Scald and Net blotch

Crop(s):          Barley

Disease(s):     Scald and Net blotch

Resistance Management Strategy for:

Group 3               Demethylation inhibitors (DMI);
Group 7               Succinate dehydrogenase inhibitors (SDHI);
Group 7 + 3        SDHI + DMI;
Group 11 + 3      Quinone outside inhibitor (QoI) + DMI;
Group 11 + 4      QoI + phenylamides (PA); and
Group 11+7+3   QoI + SDHI + DMI.

1. 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:
   1. removal of stubble,
   2. crop rotation (avoid barley on barley),
   3. control of green bridge volunteers; and
   4. the use of tolerant and resistant varieties.
2. Do not apply more than one application of a Group 7 seed treatment with foliar activity in any two consecutive growing seasons.
3. 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.
4. Do not apply consecutive applications of Group 11 containing products. This includes in-furrow i.e. if a Group 11+4 or 11+3+7 fungicide has been used in-furrow at planting, the first foliar fungicide spray must not contain a Group 11 fungicide.
5. 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. An alternative mode of action fungicide should be applied at typical foliar fungicide timing.
6. If a Group 7 or Group 11 fungicide is being applied as a foliar spray, it must be in a co-formulation or in mixture with a registered mixing partner with a different mode of action, with no known resistance.
7. 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.
8. Minimise use of Group 3 and Group 7 fungicides which are known to have compromised resistance status. Where possible, alternate between different Group 3 fungicides. Maintain Group 3 applications in line with the above guidelines and the product labels.