Fungicide performance dose-response curves for rusts and fusarium in winter wheat

Our fungicide performance trials provide independent information on the relative efficacy of fungicides against yellow rust, brown rust and head blight 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-disease-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.

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 (first published on 9 December 2025) are shown below.

One-year data is shown on this page to indicated the relative performance of a new product (Jessico Fusion). The full results show multi-year data for several products.

Disease response

Yield response

Disease response

Yield response

Disease response

Note: Full label rate of Miravis Plus for fusarium head blight control is 3.2 l/ha. 

Yellow rust

• Leading products all contained prothioconazole (Proline), isoflucypram (Vimoy, Plaxium, Jessico Fusion) or benzovindflupyr (Elatus plus). Amistar (azoxystrobin) also showed very good activity

Brown rust

• Comet (pyraclostrobin), Imtrex (fluxapyroxad), Vimoy and Myresa gave the highest control level

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 AHDB Agronomy Conference. These are available, alongside the presentation slides and video, from the fungicide performance home page.