Plant growth Regulators in Barley - Moddus Evo 2026
Barley crops have got off to a flying start in some regions this year. Is this the year to use a growth regulator? We would view Moddus Evo as a high-yield-potential management tool rather than a standard every-year input. The biggest returns occur when there is genuine lodging or head-loss risk. Growers with heavy and advanced barley crops with good sub soil moisture should read on.
Moddus Evo should be seen as insurance against losing yield you've already grown, rather than a product that creates yield by itself. The strongest responses occur when high biomass, high nitrogen and a wet spring combine to create lodging and head-loss risk.
Moddus Evo Summary
Active ingredient: 250 g/L trinexapac-ethyl Purpose: Reduce lodging, Reduce barley head loss, Improve harvestability, Protect yield and grain quality in high biomass crops
Registered timing:
- GS31 (first node detectable)
- GS37 (flag leaf just visible) in barley
- Up to 2 applications in barley.
Low Rainfall Zone Recommendation: Usually not justified.
Reasons:
- Lodging risk is generally low.
- Moisture stress is common.
- PGRs can reduce crop height without generating a yield response.
- Risk of over-regulation if the crop becomes moisture stressed after application.
Consider if:
- Exceptional stored moisture.
- Very high N rates.
- A lodging-prone variety.
- A head loss prone variety
- Forecast suggests an unusually wet finish.
Medium Rainfall Zone Recommendation: Use Selectively
Varieties:
Compass, Commodus CL, Planet, Leabrook, Titan AX, Beast, Combat, Fathom, Newton, Other tall, high biomass or longer season Varieties
Consider Moddus Evo when:
- Yield potential exceeds 5 t/ha.
- N rates exceed crop demand.
- Dense canopies develop.
- Early sowing has produced excessive biomass.
- A head loss prone variety
The fungicide + Moddus combination often delivers a stronger economic response than either input alone in high yielding seasons.
High Rainfall Zone Recommendation: Strongly consider as part of standard management.
High lodging risk factors:
- 150 kg N/ha available
- Early sowing
- High tiller numbers
- Yield potential >6 t/ha
- Tall varieties
- A head loss prone variety
The fungicide + Moddus combination often delivers a stronger economic response than either input alone in high yielding seasons.
Situations Where We Would Not Use Moddus Evo
Avoid on:
- Moisture stressed crops.
- Frosted crops.
- Nutrient deficient crops.
- Waterlogged crops.
- Crops suffering disease stress.
- Crops that have lost yield potential.
A key stewardship point from Syngenta is that Moddus should only be applied to healthy, actively growing crops.
Moddus Evo applications can help reduce the severity of head loss in barley, but timely harvest is always the best way to minimise head loss. It can buy you time.
Moddus Evo should be seen as insurance against losing yield you've already grown, rather than a product that creates yield by itself. The strongest responses occur when high biomass, high nitrogen and a wet seasons combine to create lodging or growing a variety with head-loss risk.