Fungicide performance dose-response curves for winter barley

Our fungicide performance trials provide independent information on the relative efficacy of fungicides against rhynchosporium, ramularia and net blotch 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-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

• Ipresso [NEW] –  isoflucypram + prothioconazole: An SDHI and DMI/azole
• Ascra Xpro – bixafen + fluopyram + prothioconazole: An SDHI + SDHI + DMI/azole
• RevyPro [NEW] – mefentrifluconazole + prothioconazole: Both DMI/azoles**

Straights

• Proline 275 – prothioconazole: A DMI/azole
• Myresa – mefentrifluconazole: A DMI/azole
• Imtrex – fluxapyroxad: An SDHI
• Miravis Plus – pydiflumetofen: An SDHI

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 four unregistered products were tested in 2024 (data will be released upon registration)

**Only tested in 2024: See full fungicide performance results for efficacy information.

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 (left) and eradicant (right) responses.

Combined results for 2022–24 (5 and 4 trials, respectively).

Products marked with an * are mixtures containing more than one active ingredient.

Yield response

Combined results for 2021–24 (6 trials).

Products marked with an * are mixtures containing more than one active ingredient.

Disease response

Combined results for 2022–24 (9 trials).

Products marked with an * are mixtures containing more than one active ingredient.

Disease response: protectant (left) and eradicant (right) responses.

Combined results (3 trials) for 2022–24 and 2021–24, respectively.

Products marked with an * are mixtures containing more than one active ingredient.

For rhynchosporium, Miravis Plus (pydiflumetofen), Ipresso (isoflucypram + prothioconazole), Ascra Xpro (bixafen + fluopyram + prothioconazole) and RevyPro (mefentrifluconazole + prothioconazole) gave the highest levels of control. Also good activity from Imtrex (fluxapyroxad), Myresa (mefentrifluconazole) and Proline (prothioconazole).

For ramularia, Myresa and Ipresso were more effective than Proline, but Miravis Plus gave the highest levels of control.

For net blotch, Miravis Plus gave the highest level of control. The mixtures Ascra Xpro and Ipresso also maintained good efficacy.

Mixtures offer the broadest spectrum and most robust control.

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.