Fungicide performance dose-response curves for winter barley

Our fungicide performance trials provide independent information on the relative efficacy of fungicides against rhynchosporium, ramularia, net blotch, powdery mildew and brown rust in winter barley. 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 (unless stated).

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 (released on 9 December 2025) are shown below.

Disease response (protectant)

Disease response (eradicant)

Disease response

*Vimoy does not currently have a label recommendation for the control of ramularia or powdery mildew, so it should not be applied to specifically control these diseases.

Disease response (protectant)

Disease response (eradicant)

Disease response

*Vimoy does not currently have a label recommendation for the control of ramularia or powdery mildew, so it should not be applied to specifically control these diseases.

Disease response

Rhynchosporium

• DMIs (Myresa, Proline and Revypro) and SDHIs (Vimoy and Miravis Plus) tested all gave very good control

Net blotch

• The SDHIs Vimoy and Miravis Plus were both very effective. Azoles, Myresa, Proline and Revypro (prothioconazole + mefentrifluconaozle), were also effective

Ramularia

• Miravis Plus gave the highest levels of control and Myresa was more effective than Proline

Powdery mildew*

• Prothioconazole still very effective on powdery mildew, as was the SDHI Miravis plus. Myresa also gave useful control

Brown rust*

• Miravis Plus and Proline appeared effective (1 trial)

Mixtures offer the broadest spectrum and most robust control.

*The fungicide performance project consortium works closely with Teagasc (Agriculture and Food Development Authority) in the Republic of Ireland to share dose-response data, which includes data from powdery mildew and brown rust trials in Ireland (Carlow).

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

Most 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.