This Arable Update outlines practical strategies for using SDHIs effectively in the field while protecting their long-term efficacy.
Key Points:
- In New Zealand, Zymoseptoria tritici (Zt), the cause of Septoria tritici blotch (STB) in wheat, is showing a gradual reduction in sensitivity to Succinate dehydrogenase inhibitor (SDHI) (Group 7) fungicides in the laboratory.
- SDHI fungicides remain effective at field rates. However, careful stewardship – limiting the number of applications, mixing fungicide mode of action (MoA) groups and appropriate dose - are now essential to protect their ongoing usefulness.
- Picking the right mixing partner helps to protect field performance and the long-term sensitivity of all the components of a fungicide mixture.
- FAR fungicide trials in Mid Canterbury, South Canterbury and Southland show different SDHIs and their respective mixing partners provide largely comparable disease control, yield and economic returns.
Find related updates here:
Cereals update 232: Managing Septoria: Latest results on triazole performance
Cereals update 233: Managing triazoles for prolonged performance in autumn sown wheat
Cereals update 234: Managing Septoria: Latest results on SDHI performance