This Arable Update illustrates how alternating and mixing Modes of Actions and active ingredients can help sustain disease control, protect yield, and deliver financial returns.
Key Points:
- Zymoseptoria tritici (Zt), the cause of Septoria tritici blotch (STB) in wheat, is showing reduced sensitivity to triazole fungicides in New Zealand.
- Careful stewardship, mixing, rotating, appropriate dose, and limiting triazole sprays is essential to protect their ongoing usefulness.
- Consider seasonal conditions, target disease and return on investment when alternating triazoles at T1 (GS 30), T2 (GS 39) and T3 (GS 59).
- FAR fungicide trials in Mid Canterbury, South Canterbury and Southland show how alternating triazoles provides largely comparable disease control, yields and economic returns.
- Use each triazole to its strength. Tailor how you alternate triazole active ingredient at each application timing based on your season, target disease and region.
Related updates:
Cereals update 232: Managing Septoria: Latest results on triazole performance
Cereals update 234: Managing Septoria: Latest results on SDHI performance
Cereals update 235: Managing SDHI's for prolonged performance in autumn sown wheat