Foliar fungicide activity and seed treatment options for barley

This information will help you match fungicides to the primary disease risk(s) in barley. Use it alongside our fungicide performance results and resistance management guidance to help maintain control within and across seasons.
  • Match fungicides to the primary disease risk – this depends mainly on variety, sowing date, location and local weather
  • Mixtures and alternations of fungicides, with different modes of action, from different fungicide groups, are often most effective and reduce the likelihood that fungicide resistance will develop in pathogens
  • Resistance poses a significant threat to the performance of fungicides and resistance management must be taken into account when planning fungicide programmes
  • Fungicides are tested by AHDB in specific performance trials and in other research projects targeting specific diseases
  • Performance ratings are indicative and are dependent on dose and timing
  • A score indicates that a product has been tested by AHDB but this does not guarantee label approval
  • Other active ingredients may also be registered for the control of these diseases
  • Always check the label before use

Fungicide performance for wheat, barley and oilseed rape

The Fungicide Resistance Action Group (FRAG-UK)

Fungicide activity rating for major barley diseases

Reviewed March 2024
Chemical group Active ingredient Rhynchosporium Mildew Brown rust Net blotch 5 Ramularia4
Anilinopyrimidine cyprodinil 2 L - 2 [1]
Azole    metconazole [2] L [3] [1] [1]
mefentrifluconazole [2] L [3] 3 3
prothioconazole 3 3 3 3 2
tebuconazole [2] L L [2] [1]
Phthalimides folpet 1 1 - - 2
Imidazole prochloraz L L - [1] -
Spiroketalamine spiroxamine [2] 2 [2] [1] -
Strobilurin azoxystrobin 1 - 3 1 -
pyraclostrobin 2 - 4 2 -
trifloxystrobin [2] - [3] L -
Strobilurin + azole1 fluoxastrobin + prothioconazole 4 2 3 3 1
SDHIs3 fluxapyroxad 4 2 3 3 1
isopyrazam 3 2 3 3 1
SDHI mixtures1 benzovindiflupyr + prothioconazole 4 3 L 4 L
bixafen, fluopyram + prothioconazole 4 L L 4 2
bixafen + prothioconazole 4 3 4 4 2
fluxapyroxad + pyraclostrobin 4 2 4 4 L
fluxapyroxad + mefentrifluconazole  4 L L 3 [3]
isopyrazam + cyprodinil 3 2 4 4 1
Mildewicides Active ingredient Protection Eradication
Amidoxine cyflufenamid 3 3
Benzophenone metrafenone 3 1
Quinazolinone proquinazid 2 1

5 = Highest control level

1 = Lowest control level

L = Label claim of activity where products have not been tested by AHDB

- = Insufficient data (target not cited on the label)

[] based on limited or old data

1 Mixtures with different active ingredient loadings are available, which may have different efficacy to those tested.

3 Significant resistance risk. Always use SDHI fungicides in mixture with at least one fungicide from an alternative mode of action group which has efficacy against the target pathogen(s)

4 Isolates with strong resistance to azoles and SDHIs have been found in the UK and these can no longer be relied upon for control of ramularia

5 Isolates with moderate resistance to SDHIs are present in the UK (performance of SDHIs may be compromised in some locations)

Barley seed treatment options

Reviewed March 2024
Active ingredient(s) Product Company Crop Loose smut* Leaf stripe* Covered smut* Seedling blight: Microdochium nivale* Seedling blight:
Fusarium species*
Net blotch Yellow rust Take-all Slugs Aphids
(BYDV vectors)
Wire-worm Wheat bulb fly
fludioxonil Beret Gold Syngenta Spring
  X X X X              
fludioxonil Prepper Certis Winter
  X X X X              
fludioxonil, tebuconazole Fountain Certis Winter X   X X X X            
fluopyram, prothioconazole, tebuconazole Raxil Star Bayer CropScience Winter X X X X X X            
ipconazole, imazalil Rancona i-MIX Arysta Spring
X X   X X              
ipconazole  Rancona 15 ME Arysta Spring
X X   X X              
prothioconazole, tebuconazole Redigo Pro Bayer CropScience Spring
X X X X X              
silthiofam Latitude Certis Winter               X        
sedaxane, fludioxonil Vibrance Duo** Syngenta Spring
  X X X                
cypermethrin Signal Arysta Spring
                    X X

X = Label recommendation. Control may only be partial, please refer to product label

*Seedborne disease

**Barley seed treated with Vibrance Duo must not be used for seed multiplication (certified seed)

No label recommendations for the control of yellow rust, aphids/BYDV or slugs

Disposal and spills of treated seed

If not handled correctly, treated seed may pose a risk to wildlife and the environment. Spills are most often associated with filling, (poor) calibration and moving the seed drill. Always:

  • Minimise spill risks
  • Apply via qualified operators
  • Use calibrated equipment
  • Follow product labels
  • Fill drills from as low a height as possible
  • Deal with spills immediately (ideally, use a spill kit)
  • Ensure undrilled seed is disposed of properly*

It is best to avoid the need to retain treated seed after drilling. However, if required, store it in dry conditions away from temperature extremes. If this is done, the germination should be sufficient for the following year.

*Unrequired treated seed can be sown to a ‘sacrificial’ area of land and subsequently removed by cultivation or spraying. If this is not appropriate, dispose of via a licenced waste contractor.