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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 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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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.