Autumn Weed Control in Cereals 2026

Good crop establishment is essential to maximising yield potential, and effective early-season control of grass and broad-leaved weeds plays a key role. Left unchecked, weeds can reduce yield, complicate harvest and create issues for future rotations.

Careful planning around product choice, timing and the effective stacking of residual herbicides for pre- and post-emergence weed control will help growers give crops the best possible start.

The benefits of early weed control

Early-season weed control is vital for establishing cereal crops successfully. Weeds compete with emerging crops for light, soil moisture and nutrients; this can severely damage their yield potential early on. 

Effective weed control begins before crop emergence. Applying pre-emergence herbicides as soon as possible after drilling, followed by timely follow-up treatments where required, helps protect yield potential and maintain a cleaner crop throughout the season.

Where practical, delaying drilling into October allows stale seedbeds to reduce blackgrass populations before drilling, providing a better platform for pre-emergence herbicide programmes.

Sufficient soil moisture is important for blackgrass germination and the efficacy of residual herbicides therefore cultivation techniques should be managed accordingly. 

Effective timing applying pre-ems within 48 hours of drilling, to consolidated, moist seed beds will further improve overall product performance. 

Blackgrass Focus 

For certain weeds, including blackgrass, there are very few effective post-emergence herbicides, so tackling blackgrass early is vital. 

Typically, as few as 10 blackgrass plants/ m2 can lead to a potential 5-10% yield loss in winter wheat, so both cultural control and targeted chemistry are essential in an effective blackgrass management strategy. 

Why effective residual stacking is vital for blackgrass control. 

Tank mixes (where several products are applied together) or stacking and sequencing (where several products are applied in close succession) are more effective at controlling grass weed populations than individual products and it helps with resistance management. 

Residual modes of action are vital for effective blackgrass control and pre-emergence options are less affected by resistance issues than some post-emergence options. 

The Herbicide Stack

The herbicide stack should be tailored according to the specific farm and field situation to maximise overall control levels based on the individual weed situation and spectrum, assessing the need for broad-leaved weed control as well as grass weed control. 

With a supporting range of herbicides containing key actives this allows for a robust, targeted programme or partner products which can be adapted to individual situations. 

Flufenacet: foundation for blackgrass control

AHDB research highlighted flufenacet as a key active to start with in blackgrass control programmes and that further actives are then necessary to achieve good levels of control. 

Our straight flufenacet System 50 and our co-formulated products, Clayton Facet XL and Sabre XL, offer a great starting point for blackgrass weed control this autumn.

Product Options that ensure a good, cost-effective start to weed control this autumn. 

Clayton Plant Protection offers a wide range of leading herbicides for cereal crops this autumn. Our products can help put the right building blocks in place for successful weed control. 

System 50

• 500g/l flufenacet makes it a great partner product
• Pre- or post-emergence application
• Great partner product for the control of Annual meadow grass, blackgrass and loose silky bent

Clayton Facet XL & Clayton Sabre XL

• Among the most flexible products on the market today for reliable grass and broad-leaved weed control in cereals
• Dual-active flufenacet (400 g/L) and diflufenican (100 g/L) SC co-formulation 
• Targeting problem grass and broad-leaved weeds in cereals 
• Wider labels with more use approvals than other generics, including spring wheat and barley  
• Higher maximum total dose: 0.9 L/ha than other generic competitors, for powerful weed control 
• Added flexibility with sequential split dose applications: 0.6L/ha (until 31 March) followed by 0.3L/ha (after 31 March) 
• Later cut-off spring application timings to GS23 (winter wheat) and GS24 (winter barley)

Clayton El Nino™

• SC formulation with 500 g/L diflufenican
• Flexible mixer option for autumn weed control

Building an effective autumn herbicide strategy

Planning is essential for a successful herbicide programme:

1. Identify target weeds: Focus on grass & broad-leaved weed species that are most likely to reduce crop yield or quality.
2. Understanding weeds: knowing when each species emerges/competes helps target them at their most vulnerable growth stages.
3. Product choice: Match actives to target weeds and ideal timings.
4. Use sequences and mixtures: Combine pre-emergence sprays with sequential follow-up applications to maintain residual activity and aim to use multiple modes of action to reduce selection pressure and support resistance management.