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Control Horse or Mare’s Tail – Equisetum Arvense

Horse or Mares Tail

Horse Tail Plot

Horsetail on the Plot

Horsetail or Mares Tail, Equisetum Arvense is, in my opinion, garden public enemy number one. It looks like it belongs in Jurassic Park and, unchecked, spreads like wildfire. It produces spores, spreads from the roots and even small pieces of root will grow into plants

In spring, brown green shoots appear with small cones at the tips that produce spores. (Arghh – millions of ‘em) and it grows away from creeping thin brown roots that you can hardly see as they are soil coloured. Digging out these roots is not feasible – they go down into the soil for up to 1.5 metres – yes, 5 feet.

After the spore producing shoots the ‘leaves’ or tails appear. These will die off as autumn turns to winter and the roots sit there waiting for spring when they start the cycle again.

It’s critical to controlling horsetail to hoe off the initial stalks to prevent them distributing the spores.

Controlling Horsetail with Contact Herbicides

The leaves have a waxy coat, which makes the plant highly resistant to contact weedkillers like glyphosate.

Crushing the leaves to break up the coating helps weedkiller to penetrate and become absorbed but in large areas it is not so easy to crush all the leaves . However, glyphosate weed killer will have an effect and eventually kill the plant. You will probably need 5 or more applications. Knock it back, it re-grows and you repeat. I don’t think you can clear this in less than one season with glyphosate if that.

Another method is to thicken a mix of strong glyphosate with wallpaper paste or starch and paint it directly onto the fronds.

Glyphosate used to be considered a very safe and environmentally friendly herbicide but recently a number or reports have been published that cast doubt on this and it may be best to look at alternatives.

Amcide Ammonium Sulphamate Herbicide Control of Horsetail

Amcide Weedkiller ( Ammonium Sulphamate) was fairly effective although it could 3 applications to win. However it is now delisted and not legal to use or recommend it (see below)

Kurtail Herbicide Control of Horsetail

Kurtail is effective against mares tail with the benefit of you being able to cultivate as soon as the roots have died (allow 2 to 3 weeks)

For best results treatment should be made to actively growing weeds between 1st March and 30th September. Kurtail works only when plants are actively growing. Kurtail will give effective control of horsetail through foliar (leaf) application. Best results are obtained by applying to approximately 20cm of heathy plant growth above ground.

Avoid Spreading Horsetail

I’d recommend NOT digging where there is horsetail until it is dead for sure. Otherwise it just starts springing up from the root cuttings. Drying or drowning the roots prior to composting is a must.

Organic Control of Mare’s Tail (Horsetail)

I’ve been contacted by Mr Charles Bailey who points out that Horsetail is correctly applied to the weed growing on land whereas Mare’s tail is correctly applied to the weed growing in water.

Horsetail Mares Tail (Equisetum arvense)

Horsetail Mares Tail (Equisetum arvense)
a) The stalk with spore body appears in spring
b) The leafy fronds appear later to feed the roots

He also puts forth an organic control method, which he says is effective.

Without resorting to chemicals you can control/eradicate horse tail by digging/forking through the soil when it is in the right condition: i.e. not too wet and sticky! Once you have removed as much as possible, any that shoots is easily dealt with. Before it reaches 3 ins/7cm high, hoe off an inch below the surface.

Eventually the food supply in the root is exhausted. Let it get bigger than stated and food begins to be stored in the roots again, and round and round you go ad infinitum. Never touch Horsetail with a mechanical cultivator. If you do you will understand why it has been around for 60 million years

It’s worth pointing out – and my thanks to Chris Donohue here – that horsetail is effectively one huge plant whose roots may be 100 metres in length and outside of the area accessible to cultivation.

He states: “My own assessment is that if you have Horsetail, you will never get rid of it but you can prevent it spreading to your neighbours if you treat assiduously either with glyphosate or in setting up a deep control section – many horsetail horizontal roots are no more than 1 or 2 spits deep”

Kurtail

Kurtail (previously Kibosh) which is glufosinate-ammonium will kill all grass and broadleaved weeds it contacts in approximately 7 days and provide effective control of annual and perennial weeds including thistles, couch grass and mare’s tail (or horse tail).

Glufosinate is a natural compound isolated from two species of Streptomyces fungi. It inhibits the activity of an enzyme, glutamine synthetase, which is necessary for the production of glutamine and for ammonia detoxification. The application of glufosinate leads to reduced glutamine and increased ammonia levels in the plant tissues. This causes photosynthesis to stop and the plant dies within a few days Developed primarily for use with genetically modified resistant crops.

Kurtail is degraded after contact with the soil and crops can be drilled or planted immediately after application except on sands or very light or immature peat soils. When using Kurtail on these soils allow 3 days to elapse before planting or drilling or before emergence of crops drilled prior to treatment

Kurtail is professional use only – although it seems to be freely available on Ebay!

Amcide

Amcide is no longer available as a herbicide. However I have seen ammonium sulphamate for sale on Ebay as a compost accelerator (with dire warnings about not using it as a herbicide!) Just thought you’d like to know.

Amcide (Ammonium Sulphamate) was an effective weedkiller used for killing tree stumps and brushwood clearing. In effect it is crooked sulphate of ammonia (a chemical nitrogen fertiliser). The plant absorbs it, taking it to the roots and dying.

After 4 weeks or so, it reacts with the air to form sulphate of ammonia – adding a nitrogen boost to the soil. Re-planting is safe after 6 weeks. It may make the soil more acid – so check pH.

Controlling Weeds


 

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