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Tractor spraying weeds in grass field

Controlling Weeds In Grassland

Author: Philip Kennedy 

 

After second cut silage presents an ideal opportunity to control docks and chickweed in grassland. Weeds are soft and growthy after recent fertiliser applications and rain. An actively growing weed takes in chemicals a lot more efficiently, which will help achieve great weed control. Outlined below are various solutions to control these weeds.

 

Controlling Weeds 

Nettles, Thistles, Ragwort, Dandelions, Daisies and Rushes are some of the most problematic weeds to watch out for. When controlling these weeds it is important to spray in good growing conditions with a minimum of 8 degrees average temperature or more if possible. The growing stage of the weed is also important i.e. if the weed is flowering, it is more difficult to control so it needs to be sprayed before this point. When spraying docks, the leaves should be lush green and not much more than 3 to 4 centimeters wide. Docks also thrive when the soil is low in calcium and high in magnesium so this might be worth investigating if you have a particularly bad infestation.

The best time to control docks is in a new reseed with a product such as CLOVERMAX (2,4D + MCPA). It should be applied around 4-6 weeks post sowing at a rate of 7l per ha with at least 200l per ha water volume. When applying a herbicide on grass, it helps to apply some fertiliser close to spraying as this will decrease any negative effect on grass growth and encourage weeds to grow and take chemistry into the plant more effectively, thereby encouraging a better kill out.

 

 

Weed Control Solutions 

  • Eagle is an effective dock control solution if you also want to try and save clover. Most dock sprays will kill clover.
  • Pasture pack represents a new concept in grass weed control. The tank mix option for Thrust (2,4D + Dicamba) and Tandus (Fluroxypyr) allows farmers to reap the benefits of three different active ingredients, providing a cost-effective solution to Docks, Nettles, Dandelions, Daisies and Chickweed.
  • D50 (2,4D) provides excellent control on Ragwort which is poisonous to animals. This must be applied at the rosette stage in March or April and animals must be kept off the field until the weed has withered away.
  • Agritox (MCPA) is a good option for the control of Charlock, Thistle, Fat hen, Buttercup and Rushes. If you are using it for the control of Rushes, it is recommended to use a sticker such as Kantor due to the waxy nature of the rush. For best control, Rushes should be sprayed when young and ideally growing.
  • Minstrel (Fluroxypyr) is good on both docks and chickweed.

Some products can be used in conjunction with each other and our Cooney Furlong Farm Representatives are available to discuss your specific weed control options.

 

The full Corteva range is also available in the Cooney Furlong Grain Branches as follows.

Chart matching weeds to herbicide solutions

 

 

For a full list of details on each herbicide, click here.

 

Further Information

To view more articles from our Summer Newsletter, please click here.

 

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Claas combine harvester working

Grass weed control before and during harvest

Author: Jimmy Staples 

 

Unfortunately, there is no room for a holiday when it comes to controlling grass weeds as one slip-up can lead to large quantities of seed being introduced back into the seed bank and undoing a lot of the good work that has already been done during the growing season. There are a number of actions that can be taken now and during the harvest that can complement actions already taken and enhance the level of control achieved.

 

Grass Weeds

With the plant protection season drawing to a close, now is a great time to get back into crops and identify any potential issues. At this time of the year, grass weeds will have emerged above the crop canopy and when they have headed out, it is the easiest time to identify them. The main grass weeds that we need to be concerned about are as follows:

 

 

Diagram of grass weeds

 

 

Grass Weed Control: Before Harvest 

All of these grass weeds can multiply rapidly so a zero-tolerance approach should be taken especially where herbicide resistance has been identified. At this stage in the year, preventing seed return should be a priority. Walking your crops after the final sprays have been applied is a good habit to get into as it allows you to identify any troublesome patches within fields that may not have been controlled by herbicides.

It’s worthwhile taking samples from these weeds and sending them off to the Teagasc Enable Conservation Tillage Programme for resistance testing. We have confirmed resistance in populations of wild oats and ryegrass here in Wexford so it pays to be vigilant.

Where crops are clean and herbicides have done their job, pay attention to areas where the sprayer may have missed such as the ins and outs on headlands, field gaps/gates and areas on the headland where turning. These areas can provide useful information about what weeds are in the field and allow you to plan ahead if something new or unusual is found.

Practical options for preventing seed return will focus on rogueing which is your most cost-effective tool where populations are low. Where larger patches are identified, crop destruction or whole cropping may have to be considered depending on the current crop and your planned rotation.

 

Grass Weed Control: During Harvest 

Avoid harvesting areas where a significant population of grass weeds is present as you risk spreading weed seeds further across the field and potentially through your farm or where harvesting and baling are done on hire to another farm.

During harvest, machine hygiene has become increasingly important to help stop the spread of grass weeds and particularly where resistant weeds have been identified. Combines and balers are two of the biggest culprits when it comes to the spread of grass weeds, therefore it is important to clean down these machines when moving from field to field or farm to farm where grass weed issues have been identified.

Where possible, combines and balers should be blown down before moving to a new field or farm. Many newer combines will have a cleaning programme which can simplify the task and reduce the time involved. Having a compressor or a leaf blower at hand will greatly speed up the job. Nobody can be expected to fully clean down a combine or baler in the field but spending half an hour cleaning down a machine could prevent years of heartache and frustration.

Putting a strategy in place to help control and stop the spread of grass weeds can be relatively straightforward, it’s just a matter of finding the time to sit down and make a plan.

If any customers have an issue with grass weed, please contact Jimmy Staples directly.

 

Further Information

To view more articles from our Summer Newsletter, please click here.

 

Get In Touch

For the most up to date information on our products and services, please click here or follow us on Facebook and Twitter.