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Agronomy Support

Broad-leaf weed pattern spotted in winter cereal crops

Winter cereal growers should not ignore broad-leaved weeds after reports of populations breaking through early applications of residual chemistry.

Two common scenarios have been identified by Dow AgroSciences’ field teams, according to the company’s cereals herbicide specialist Stuart Jackson.

“Generally speaking the first application of flufenacet-based residual herbicides targeting autumn germinating grass weeds have been applied in a timely way to winter cereals, often within 24 hours of drilling,” Mr Jackson said.

“But we are seeing a significant number of examples where residual chemistry has been compromised by poor seed beds and dry conditions. Fields with a lower grassweed pressure have dropped down the priority list and most are yet to be sprayed. However, these fields are the most likely to experience a flush of autumn germinating weeds.”

“Depending on drilling date these weeds could be three or even four leaves – well beyond a growth stage that can be controlled by residual herbicides alone.”

On the ground, Dow’s regional teams are reporting populations of cranesbill, poppy and fool’s parsley emerging, along with volunteer oilseed rape and beans.

Where conditions allow, there is still an opportunity for growers to tackle any issues they have this year, rather than waiting until spring. Mr Jackson suggests growers consider adding a compatible contact-acting herbicide which performs in cold and variable temperatures when topping up on residuals in the coming days and weeks.

He said: “Growers are now heading back in to crops to top up residuals and it is a good idea to add a contact-acting herbicide with autumn approval to take these weeds out.”

Two herbicides proven to act on broad-leaved weeds in cold and variable conditions are Spitfire and Zypar. Spitfire (fluroxypyr + florasulam) can be applied from growth stage 13 in fields where volunteer beans, brassica weeds, groundsel and mayweeds are a problem.

This is the first autumn that Zypar is available to growers after being launched in March.

“Based on Arylex Active (halauxifen-methyl) Zypar controls a wider weed spectrum than Spitfire, in addition controlling Cranesbill, Poppy and Fool’s Parsley,” Mr Jackson added.

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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 – Report 5 – week ending 17th November 2017

This gives timing advice for application to oilseed rape. (For beans, Kerb® Flo 500 must be applied within 7 days of drilling but before crop emergence).

Soil temperatures have cooled (at 30 cms) in the main oilseed rape growing areas and applications are being made. Still dry for best efficacy on blackgrass in places, particularly in Eastern England, and parts of Nottinghamshire and Lincolnshire, but moisture in the top 5 cms, where the propyzamide is active, will help alleviate this.

There is considerable risk to water if there is heavy rainfall within 48 hours after application to a dry soil, so caution is recommended. Too dry and propyzamide will not bind to the soil leaving it susceptible to leaching away in a high rainfall scenario and washing too deep into the soil past the rooting zone of the blackgrass.

Check out application conditions for your local postcode

 

Click on the link to the left to use the postcode checker. 

Simply enter your postcode in the banner and click GO to view the results.

 

 

 

 

Please ensure good practice when using Kerb Flo 500 or ASTROKerb to avoid restrictions on these products. 

 

 

FAQs

Will large crop canopies interfere with blackgrass control?
Trials have shown that even where canopies are dense, excellent blackgrass control can be achieved once optimum soil conditions are met.
As ASTROKerb will mainly be used for blackgrass, this should drive application timing. ASTROKerb has both contact and root activity on poppies and mayweeds and in our extensive trials programme, when optimally timed for blackgrass control even where canopies were large, control of these broad-leaved weeds has been good.

Download  Topic Sheet 16 “Advice for Blackgrass Control in Oilseed Rape” for further advice

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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 13 December 2017 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.

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.

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.

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.