Grassland Agronomy Update – May 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
  • Dose rates and perennial weeds
  • Spot treat with GrazonPro
  • Right time to spray buttercups
  • Use the Grassland APP for 24/7 support
  • FAQs
  • Dow AgroSciences show calendar

Target docks after silage

docks regrowing after cutting
You need 3 weeks before cutting to spray Doxstar®Pro to enable it to fully translocate down into the dock roots. Where that window is not available plan to spray around two weeks after cutting instead.

The re-growth will have fresh green leaves and all at a similar stage, ideal for taking up a translocated herbicide. There will be less grass too making it easier to hit the target plants.

DoxstarPro gives good control of both broadleaved and curled docks. Apply at full dose rate of 2 L/ha in a water volume of 300 L/ha, unless air inclusion nozzles are being used, when the water volume can be reduced to 200 L/ha.

DoxstarPro is very safe to grass – recent market research carried out by Dow AgroSciences shows this is still top of the concerns for grassland farmers who spray herbicides.


Leystar on maize

New Leystar® has approval for post-emergence weed control in maize

Leystar combines clopyralid, fluroxypyr and new active for maize florasulam making it a very wide broad spectrum herbicide.

It should be applied when the forage maize is between the three and six leaf stage and before the crop is over 20 cm tall. It must not be applied once the buttress roots have started to develop on the first node.

Annual weeds that will be controlled include:

  • Black nightshade
  • Black bindweed
  • Charlock
  • Chickweed
  • Cleavers
  • Fat hen
  • Mayweed

LeystarLeystar will be an ideal partner in a program where pendimethalin is used.

The dose rate is 1.0 L/ha and it can be applied to maize from 10th April to 31st May. We hope to have this cutoff date extended for 2018 use.

Find more information on our Leystar Technical Information sheet.

 


Spray thistles in May/June

May/June is the time to spray thistles. Thistles tolerate dry conditions and will outcompete grass for any residual moisture. They prevent animals grazing all the grass in a field and are thought to help spread orf, a highly contagious viral disease of lambs and ewes.

The virus lives in the surface of the skin, but infection gets going once the skin is scratched by lambs grazing too close to thistles.

Affected ewes often develop mastitis. Infected lambs do not grow as quickly as healthy lambs, and they take longer to finish and market.

Topping thistles gives only temporary reprieve, especially with creeping thistles as they produce more stems from buds running below ground after cutting.

Options for spraying thistles

  • Where thistles dominate, spray with Thistlex® using a tractor mounted or self-propelled sprayer. Thistlex also controls nettles.
  • If the area taken by the thistles is less than 5%, spot treat with Grazon®Pro.
  • If a broader range of weeds is involved, use the Pas·Tor® Agronomy Pack.

All these products will take out all species of thistles, such as Spear, Creeping or Marsh. Tackling them now reduces the amount of new plants that will germinate from seed this year.


Dose rates and perennial weeds

Dose rates on products are set using the criteria minimum effective dose. Reducing a dose rate particularly on perennial weeds is likely to result in poor weed control and survival.

Adjuvants can have complimentary activity e.g. drift retardence or limiting the effect of herbicide lock up in hard water areas but adjuvants are not a substitute for dose when targeting perennial weeds.

When adjuvants are used on crops destined for human or animal consumption, residues data must be submitted, showing the effects of the adjuvant on pesticide residue levels.

No residues data will be required where the adjuvant is used with a pesticide half or less than half the approved rate of the pesticide.  Reducing the rate by this level and including an adjuvant is also false economy. The effect on the target weeds will be significantly reduced from spraying at the full rate on its own. Further lower rates leads to more incidences of repeat spraying which is not good for the environment and with many grassland sprays being applied by a contractor, unnecessary cost.


Spot treat with GrazonPro

There is really only one option for spot spraying in grassland and that’s Grazon®Pro. There is a need to be able to control small areas of docks, thistles, nettles and other weeds by hand, for example around gateways and water troughs. It is also more cost effective than a boom spray where weed populations are below 5%.

  • GrazonPro contains 60 g/litre of clopyralid + 240 g/litre of triclopyr
  • Excellent control of broadleaved dock, curled dock, creeping thistle, spear thistle and common nettle and a large range of other weeds
  • Fast acting and translocates down to the roots
  • Animals can be re-introduced after only seven days (not if ragwort is present)
  • Rainfast in two hours
  • Very safe to grass
  • Good value for money – 16 knapsacks from each litre of product when mixed in 10 litre batches
  • Comes with free measuring beaker

GrazonPro is for professional use and can only be used by suitably qualified people who hold a PA1 and PA6 certificate.


Right time to spray buttercups

Best levels of control are achieved before flowering. If you spray when they are in flower you can still get good control but not to the same level as if sprayed earlier.

Envy® – our new solution for weeds typically found in pastures which receive minimal nitrogen, controls both creeping and meadow buttercups, daisies and dandelions and is also pretty effective on plantains.

These weeds will smother grass and limit the provision of forage to grazing animals. Envy contains florasulam + fluroxypyr, it has no manure management restrictions after use – so ideal to use in pony paddocks. Its short stock withdrawal period of just 7 days makes planning in its use much easier then phenoxy based options which require a 14 day stock withdrawal period.


Use the Dow AgroSciences Grassland APP for 24/7 support

Use the Dow AgroSciences Grassland APP for 24/7 support and to access product labels, product technical sheets and our FAQ database at any time.

Download the Grassland App, by using one of these links:

App Store / Google Play / Windows Store 

If the App is already downloaded, please ensure the latest version is being used.


FAQs

Q.  How does the Pas·Tor Agronomy pack compare to PastorPro?
A.  
One Pas·Tor® Agronomy Pack will treat 2 hectares and give the same level of control that Pastor®Pro would do if it was applied at 3.0 L/ha.

Q.  Can I use Envy through a knapsack?
A.  
No. Its use in this way is not supported by Dow AgroSciences. The only product we have for knapsack use in established grassland is GrazonPro which should cover all needs.

Q. I want to make the Forefront®T stewardship recommendation via the APP but I don’t have a smart phone, what do I do?
A.  
Use the stewardship feature on the web: http://grassland.farming.co.uk

 


Show Dates

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

Catch the team at:

May 24th &  25th Grassland & Muck Stoneleigh Park, Warwickshire
May 31st NSA Highland Sheep Strathpeffer, Ross-shire
June 7th NSA North Sheep Tow Law, County Durham
June 8th Scottish Beef Event Earlston, Berwickshire
June 20th NSA Sheep South West Tiverton, Devon

 


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

For further information please contact the technical Hotline on 0800 689 8899 / UKHotline@dow.com or go to www.grassbites.co.uk

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 Dow.  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
GrazonPro contains clopyralid and triclopyr
Leystar contains fluroxypyr, clopyralid and florasulam
PastorPro contains clopyralid, fluroxypyr and triclopyr
Pas·Tor Agronomy Pack contains clopyralid, fluroxypyr and triclopyr
Thistlex contains clopyralid and triclopyr

 


Dow AgroSciences Limited, CPC2, Capital Park, Fulbourn, Cambridge, CB21 5XE.  Tel: +44 (0) 1462 457272.
Technical Hotline: 0800 689 8899 email: UKHotline@dow.com | uk.dowagro.com

 

 

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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 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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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 2 CPD points for subscribing to this email update. Contents Time to spray docks Spray buttercups with Envy Clean start […]

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Spray docks three weeks before first cut silage 10/04/2017

Spraying docks with a translocated herbicide now, when they are young, healthy and actively growing, will increase grass silage yields and improve the feed quality of the resulting forage. Docks are growing early this year, due to the relatively mild winter and warm start to spring. They have good root systems and will out-compete the […]

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Chickweed in grassland 31/03/2017

Chickweed is a weed which can quickly grow and smother a young ley or established grassland – particularly where slurry injection is taking place. It is currently warm during the day but cooler at night. Weeds are growing but selecting the right solution is important. Envy™ , a new solution from Dow AgroSciences containing the new […]

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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, PastorPro 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.