Fungicide performance dose-response curves for septoria tritici in winter wheat

Our fungicide performance trials provide independent information on the relative efficacy of fungicides against septoria tritici in winter wheat. This page features the latest disease and yield dose-response curves.

Data from our fungicide performance trials is used to plot dose-response curves. The charts show the average performance of fungicide products (disease and yield responses) across sites, seasons and leaf layers.

Curves that fit the data points well and have clear separation are most likely to reflect real differences (in terms of field performance).

To maximise differences between treatments, the trials use:

• High-risk locations
• Highly susceptible varieties
• One spray timing

It is not possible to test all products in fungicide performance trials. The products are carefully selected to:

• Provide the most relevant results
• Give equal opportunity for agrochemical companies to include products in trials
• Put emphasis on testing pre-registration or new active ingredients*
• Include standard products for which there is good understanding of performance (to aid comparisons)

*Only authorised plant protection products feature in the dose-response curves.

Mixtures (chart on the left)

• Revystar XE – fluxapyroxad + mefentrifluconazole:  An SDHI + DMI/azole
• Univoq  – fenpicoxamid + prothioconazole: A QII + DMI/azole
• Ipresso [NEW] – isoflucypram + prothioconazole: An SDHI + DMI/azole

Straights (chart on the right)

• Myresa – mefentrifluconazole (revysol): a DMI/azole
• Peqtiga – fenpicoxamid (inatreq): a QII
• Vimoy – isoflucypram (iblon): An SDHI
• Miravis Plus – pydiflumetofen (adepidyn): An SDHI

Both charts

Both charts also include two products tested at full label dose.

• Arizona – folpet: a multi-site
• Proline 275 – prothioconazole: a DMI/azole

Further information

• Check product labels prior to use
• Use straights in mixtures with at least one other fungicide with an alternative mode of action that has efficacy against the target disease
• A further six unregistered products were tested in 2024 (data will be released upon registration)

Note: For the cereal trials, the doses are quarter, half, full and double the recommended label rate (the latter improves the ‘fit’ of curves, but these results are not published online).

A selection of the key charts are shown below.

Disease response (protectant)

Combined results for 2022–24 (16 trials).

Disease response (eradicant)

Combined results for 2022–24 (4 trials).

Yield response

Combined results for 2022–24 (12 trials).

• The most recent trial year (2023–24) was wet during in autumn, winter and spring, with a mild winter (with few frosts), resulting in high levels of septoria tritici and brown rust in the trials
• The highest levels of septoria tritici control were achieved by Miravis Plus (pydiflumetofen), Peqtiga (fenpicoxamid), Ipresso (isoflucypram + prothioconazole) and Univoq (fenpicoxamid + prothioconazole)
• Vimoy (isoflucypram) and Myresa (mefentrifluconazole) maintained good activity
• Although no major shifts in fungicide sensitivity have been detected in septoria tritici pathogen populations in recent years, small sensitivity shifts continue to be observed at some sites
• Mixtures offer more robust disease control and yields than straight fungicides
• Use a combination of fungicide mode of action groups to reduce the risk of resistance development

The full fungicide performance results cover all target diseases for wheat, barley and oilseed rape.

The charts on this web page show the average performance of fungicide products over multiple seasons.

The full results also include single-year data.

The latest results are released in December at the annual. These are available, alongside the presentation slides and video, from the fungicide performance home page.