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Agronomy Support

Spring wheat weed control boosted by new approval

Spring wheat growers have a new weed killer at their disposal this season after Dow AgroSciences secured approval for Broadway Star to be used in the crop.

A co-formulation of the company’s long-standing actives pyroxsulam and florasulam, the product has been a cornerstone of spray programmes in winter cereals. Now spring growers have a new option in the fight against yield-robbing broad-leaved weeds such as poppy, cleavers, brassica weeds, cranesbill, groundsel, speedwells and pansy. Importantly, the product also delivers activity on spring germinating wild oats.

Dr Alex Nichols, cereal herbicide product manager, said; “Spring wheat has become a vital crop for growers who are trying to get on top of blackgrass and 85,000ha were planted in 2017 – nearly triple what went in the ground in the previous season.

“They need a simplified and cost effective approach to weed control and now have the option of using one product to control the main yield robbers.” The approval has come in time for applications from 1 March to 31 May from growth stages 21 to 32. The maximum application rate is 200g/ha in spring wheat and it is safe on all varieties, regardless of when they were sown.

“For optimum results growers should follow the basic principles of ALS chemistry by waiting for weeds to display active growth before treatment,” Dr Nichols added.

“An adjuvant must be used and applications should be made using a fine to medium spray quality.”

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Grassland and Maize Agronomy Update – February 2018


Grassland & Maize newsletter

Welcome to the Grassland and Maize Agronomy Update from DowDuPont. With the merger of Dow AgroSciences, DuPont Crop Protection and DuPont Pioneer, this newsletter now covers maize as well as all things grassland.

These regular technical notes are a seasonal commentary to help those interested in improving grassland and forage productivity on dairy, beef, sheep and equestrian enterprises.

You can claim two CPD points for subscribing to this email update.


  • Weed control in new sown leys
  • Chickweed
  • Aminopyralid stewardship training
  • Maize hybrids
  • Low drift technology
  • Spray packaging – USP’s
  • Grassland BASIS courses
  • FAQ’S
  • Shows Calendar

Weed control in new sown leys

Good quality grazed grassland is still the cheapest feed source for livestock. Reseeding to keep pastures in peak condition is an important part of grassland management, but it is expensive, so it is important that it is done correctly. In new sown leys the key target weeds are annual species such as chickweed, redshank and fat hen, plus seedling docks and thistles.

There are few herbicides approved for use on new sown leys, so Leystar™ and Envy™, new last year, have quickly found favour for use in newly established grassland. For best results apply when weeds are small and actively growing. Spraying early in a sward’s life will ensure a clean start, allowing grass to establish quickly without competition from weeds. It is more economical and effective to treat weeds at this stage than wait for them to establish and treat when they are bigger.

chickweed in grasslandChickweed

Chickweed can quickly grow and smother a young ley. It can also take hold in gappy established grassland.

Leystar and Envy are both effective on chickweed in new sown leys.

In established grassland and where it is the main weed use Envy. If other weeds are present consider DoxstarPro®, Forefront T® and the Pas·Tor Agronomy Pack® which all effectively control it.


Aminopyralid stewardship training

All Forefront T purchases need to be authorised by a trained advisor. This is a simple process using the Dow Grassland App.

If you would like to receive aminopyralid stewardship training to be able to recommend Forefront T, please contact your local representative, or contact the Technical Hotline on 0800 6898899 /



Maize hybrids

New maize hybrids from Pioneer for 2018

P7034 can be grown on all but the coldest sites, and its dent-like grain texture will improve silage quality immediately after ensiling due to faster starch digestibility.

P7932 provides an intermediate maturity option for those cultivating under film using the Samco System
Pioneer Maize Hybrid Line-Up 2018

For further information on Pioneer maize hybrids see

Low drift technology

Achieving good spray coverage is important for getting sufficient amounts of the active ingredients in the herbicides onto the leaves.

Where flat fan nozzles are used always follow the label advice on water volumes. If an operator wants to apply at a water volume of 200 L/ha, DowDuPont supports this if applied with air inclusion nozzles. See our short instructional video.




Spray packaging unique selling points (USPs)

All of DowDuPont grassland herbicides are supplied in PET (polyethylene terephthallate) based packaging. This offers operators improved ease of use and simpler washing, whilst delivering environmental benefits due to reduced weight and easier disposal.

For sprayer operators, the first obvious difference between PET and High Density Polyethylene (HDPE) packaging is the transparency of the grey shaded material, allowing the contents to be seen at a glance. The caps are ergonomically designed for ease of opening, even when wearing protective gloves. In addition, there is no foil seal which reduces the risk of spillage in the handling areas and speeds up filling.

The cylindrical shape with central opening allows easy pouring and reduces the risk of ‘glugging’.

What is not apparent to the naked eye is the smoothness of the inner surface. This means any chemical residue left in the bottle is rinsed out easily – again making life easier for sprayer operators. Finally, with cap and bottle being made of the same material, there is no need to hold separate stocks for disposal.

Grassland Product Range


BASIS courses

Considering taking BASIS? Then look at BASIS Certificate in Crop Protection (grassland and forage crops).

Its ideal for those focused on the livestock sector and enables you to give bespoke advice to farmers seeking support. Upon completion you will: advise:

  • Be aware of the different types of grassland found in the UK
  • Understand the different plant species used in grassland and their role in production
  • Explain how plants grow and develop through the season and the effects this has on feed value
  • Understand how weed problems develop in forage crop situations and the steps appropriate to control them
  • Appreciate the economic and environmental importance of grass and forage crop pest control
  • Recognize potential diseases and recommend appropriate methods of prevention, treatment and control
  • Understand pesticide safety and approve aspects specific to grassland/ livestock farm situations
  • Understand pesticide application in forage crop situations
  • Understand aspects of hand-held and small scale/local pesticide application methods.

Visit BASIS: to find out when and where the courses are being run in 2018.


Q.  What will control mouse-eared chickweed?
A.  Envy or Leystar will control mouse-eared chickweed.

Q.  When can clover be stitched in after treating a new ley with Envy or Leystar?
A.   You can establish clover three months after application of Envy or Leystar.

Show Dates

The technical team from Dow AgroSciences will be out and about at many shows and events this Spring, talking to farmers and agronomists and answering questions on how to tackle weed problems in their fields.

Catch the team at:

Feb 7th Dairy Tech Stoneleigh Park, Warwickshire
Feb 28th RNAS Spring Show Thainestone Ag Centre, Inverurie
May 10th Grassland UK Bath & West
May 16th Royal Welsh Grassland Carnbwll, Four Crosses, Powys SY22 6SN
May 17th FTMTA Grass & Muck Gurteen College, Birr
May 25th NBA Beef Expo Halls Shrewsbury Livestock Auctions Centre
May 30th NSA Scot Sheep King Arms Farm, Ballantrae

For regular updates on agronomic issues, find us on Twitter and Facebook

For further information please contact the technical Hotline on 0800 689 8899 / or go to

Use plant protection products safely. Always read the label and product information before use. For further information including warning phrases and symbols refer to label.

®™ Trademark of the Dow Chemical Company (“Dow”) or an affiliated company of DowDuPont or Pioneer.  All other brand names are trademarks of other manufacturers for which proprietary rights may exist.

DoxstarPro contains fluroxypyr and triclopyr
Envy contains fluroxypyr and florasulam
Forefront T contains aminopyralid and triclopyr
Leystar contains fluroxypyr, clopyralid and florasulam
Pas·Tor Agronomy Pack contains clopyralid, fluroxypyr and triclopyr

DowDuPont, CPC2, Capital Park, Fulbourn, Cambridge, CB21 5XE.  Tel: +44 (0) 1462 457272.

Technical Hotline: 0800 689 8899 email: |

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Kerb Weather Data – End of season

The Kerb® Flo 500 and ASTROKerb® application window is now closed for this season.

Please revisit this page mid October, when the Kerb Weather Data service will start again, providing advice on when conditions are optimal for applications of Kerb Flo 500 and ASTROKerb

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View All Topic Sheets
What are the LERAP requirements for Broadway Star/Palio?

The CRD re-approvals for Broadway Star (MAPP 18273) and Palio (MAPP 18349) removed the requirement for a buffer zone and therefore LERAP requirement for these products. It is however important to check other requirements e.g. Cross Compliance for the Basic Payment Scheme (BPS) requires no application of pesticides to land within 2 metres of the centre of a watercourse or field ditch, or to land from the edge of the watercourse or field ditch to 1 metre on the landward side of the top of the bank of a watercourse or field ditch.

What is the current situation with regard to Unite?

Unite, along with other products that contain flupyrsulfuron, are now subject to a withdrawal notice. The timelines are as follows:

Up until the 31 March 2018 Unite can be sold (sales period)

Up until the 13 December 2018 Unite can be used, stored or disposed of (use-up period)

Full details of the withdrawal notice can be found here

Please note this withdrawal does not affect Broadway Star and Palio

Why is Unite subject to a withdrawal notice?

The active substance, flupyrsulfuron, has not been approved for renewal at an EU level. Note this does not affect Palio and Broadway Star as these products do not contain flupyrsulfuron.

What are the following crop restrictions/cultivation requirements for Pixxaro EC?

After an application of Pixxaro EC at 0.5 L/ha up to BBCH 45, the following crops may be sown.
• Autumn: Beans*, Cereals, Clover*, Grass, Lucerne*, Oilseed Rape, Peas, Phacelia
• Spring: Beans, Cereals, Clover, Grass, Lucerne, Maize, Oilseed rape, Onions, Peas, Potatoes, Sugar beet, Sunflowers

*Plough prior to sowing

The Pixxaro EC label advises ploughing prior to sowing winter beans, however, Dow AgroSciences support autumn sown field beans without ploughing prior to drilling, following an application of Pixxaro EC (in spring to the previous cereal crop) with one exception: high pH soil (8 or over) in a dry summer, in these situations ploughing is then recommended prior to drilling autumn sown field beans.
We are working on adding following crops such as carrots, brassica transplants and borage as a following crop.

When is the best time to control sterile brome in winter wheat?

Sterile or barren brome germinates in the autumn and grows very quickly.

Control is best achieved in a programme with  2000g ai/ha pendimethalin followed ideally by autumn applied Broadway Star or Unite. Best control is achieved when applied before GS24 of the brome.  

Which pre-emergence herbicide should I use for ryegrass control in a Broadway Star programme?

Use 3200 g  ai / Ha of prosulfocarb.  Additional pendimethalin may help.

Can the straw from oilseed rape treated with ASTROKerb be used for animal bedding?

Oilseed rape straw from crops treated with ASTROKerb needs to remain in the field and must not be baled and used for bedding.  It may be removed from the field to be used for burning for heat or elctricity production.

Can I plant cover crops even where they are not listed as a following crop on the label?

The planting of any crop (not subject to human consumption/MRL requirements) not specifically  recommended on the label would need to be at the users risk where following crop safety has not been demonstrated.

What is the knapsack rate for DoxstarPro, Forefront T, Pas·Tor and Thistlex?

These products are not recommended for application through a knapsack. GrazonPro at 60 ml in 10 litres of water is the best product for spot treatment.