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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Problem Solution Dose Rate Water Volume Grazing Interval
Docks and Chickweed 2.0 L/ha 300-400 L/ha 7 days
Weedy paddocks
Chickweed control
Weeds in new sown leys
1.5 - 2.0 L/ha 200-400 L/ha 7 days
Docks, Thistles, Nettles, Buttercups, Dandelions and Ragwort 2.0 L/ha 200-300 L/ha 7 days
Knapsack/spot treatment: Docks, Thistles, Nettles, Brambles, Gorse and Broom 60 mls 10 Litres 7 days
Weed control in new leys, grass for seed and maize 1.0 L/ha 200 L/ha 7 days
Docks, Thistles, Nettles 1 L/ha Pas + 1 L/ha Tor 200 L/ha with air inclusion nozzles 7 days
Thistles 1.0 L/ha 200-400 L/ha 7 days

Grassland and Maize Agronomy Update – February 2018 26/02/2018 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, […]

Read the full story

Leystar brings new confidence to grassland reseeding 20/07/2017

Avoiding growth checks in young grass and controlling a wide variety of weeds are beef and sheep farmers top priorities when it comes to spraying new sown leys with herbicide. This is according to a survey carried out by research company Independent Business Resource on behalf of Dow AgroSciences earlier this summer. “These worries stem […]

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Grassland Agronomy Update – May 2017 17/05/2017

Welcome to the Grassland Agronomy Update from Dow AgroSciences. These regular technical notes are a seasonal commentary to help those interested in improving grassland productivity on dairy, beef, sheep & equestrian enterprises. You can claim two CPD points for subscribing to this email update. Contents Target docks after silage Leystar on maize Spray thistles in May/June […]

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Two new grassland herbicides at Grassland and Muck 2017 26/04/2017

Dow AgroSciences will be profiling two new grassland herbicides at Grassland and Muck 2017, and showing farmers how much grass they lose from having broad-leaved weeds like docks, thistles and nettles growing in their fields.   Leystar, designed for new sown leys and maize, controls a very wide range of weeds such as chickweed, bindweed, […]

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Grassland News Archive
Are Dow AgroSciences grassland herbicides clover safe?
No, clover will be killed or severely checked by applications of Dow AgroSciences’ grassland herbicides.  However you can stitch clover back in after six weeks of applying PastorPro, Thistlex, DoxstarPro or GrazonPro. When using Forefront T, clover can be reintroduced four months after application.
Can any of the Grassland products; DoxstarPro, Forefront T, PastorPro, Thistlex or GrazonPro be tank mixed with MCPA or 2,4-D?
This approach is not recommended and is not supported by Dow AgroSciences. Quick 'burn down' of top growth with phenoxy herbicides can hinder movement of the translocated active ingredients in DoxstarPro, Forefront T, PastorPro, Thistlex and GrazonPro to the roots, leading to poor levels of weed control.
Can DoxstarPro, Forefront T, PastorPro, Thistlex or GrazonPro be used on new leys (<12 months old)?
No. Grassland should be at least 12 months old for all of the above products. Use Leystar or Envy for grass leys under 12 months.  
Can I apply PastorPro through a Knapsack?
No. There is no approval for hand-held application of PastorPro. Consider using  GrazonPro for hand-held applications.
Will PastorPro control thistles?
Yes. Apply at 4.0 L/ha.
Can I use GrazonPro on my lawn?
No. GrazonPro is a professional product recommended for use only as an agricultural herbicide.
How rainfast is GrazonPro?
If GrazonPro is applied to a dry leaf it will be rainfast in 2 hours.
What rate of GrazonPro should be applied through a knapsack?
60 ml of GrazonPro in 10 litres water.
What is the grazing interval for GrazonPro?
Seven days. Ideally allow 28  days if cutting the field for silage or hay. The seven day exclusion period may need to be extended if poisonous weeds are present.
Will GrazonPro control chickweed?
No, but DoxstarPro, Forefront T and PastorPro all give excellent control when applied under the correct conditions.
What is the best Dow grassland product for cow parsley control?
GrazonPro offers good control of cow parsley when used at the rosette stage. It is for spot treatment only. Forefront T and PastorPro can be applied through tractor mounted hydraulic sprayers. Forefront T offers moderate control of cow parsley. Forefront T use is limited to grass grazed by cattle and sheep only.  Although not as effective at Forefront T, PastorPro offers some control of cow parsley and can be used on field including those for silage and hay.
What is the cutting interval after spraying weeds in grassland?
After application of our products leave a minimum of 21 days, ideally 28 days  before cutting to allow maximum translocation of the active ingredients down to the roots of weeds.
What is the grazing/cutting interval after application of PastorPro?
Seven days for grazing and ideally 28 days if grass is being cut. The seven day exclusion period may need to be extended if poisonous weeds are present.
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.
What is the stock exclusion period for hens?
The same as for livestock: seven days and until foliage of any poisonous weeds such as ragwort has died and become unpalatable.  
What is the stock exclusion period for horses for Doxstar Pro, GrazonPro, PastorPro and Thistlex?
The same as for livestock: 7 days and until foliage of any poisonous weeds such as ragwort has died and become unpalatable.
What products do Dow AgroSciences recommend to control brambles in grassland?
Brambles should be sprayed between June and August, when plants are actively growing, but before plants begin to senesce in the autumn. It is essential that all foliage is thoroughly wetted or incomplete kill may result. The maximum concentration must not exceed 60ml of GrazonPro per 10 litres of water.   Blaster Pro can be used to control brambles in amenity grass.
What water volumes do I need to control docks in established grassland with Doxstar Pro?
Whenever DoxstarPro is used in established grassland the rate of water should always be 300-400 L/ha.
Will any Dow AgroSciences product control ragwort in horse paddocks?
No Dow AgroSciences product is recommended for control of ragwort in horse paddocks. The best method of control is to dig them up. 2,4-D can be used as an overall spray.
Will DoxstarPro, Forefront T or PastorPro control large flowering docks?
No. They must be topped and allowed to regrow. Treatments should then be made under good growing conditions to actively growing plants when they reach the rosette stage.
Will Thistlex control dandelions?
Yes, but it is not an 'on label' weed. Consider topping dandelions and then applying Thistlex 2 - 3 weeks later at the rosette stage of the weed.