Japanese Knotweed control?

[Peasgood]

I'm after a bit of advice off you knowledgable folk please.

In the spring I found a very small patch of knotweed on my place. It wasn't much at all and i thought/hoped that I had pulled it up.

I looked again yesterday and there are three spreading shoots that are a couple of feet high (not spears)

 

What in your experience is most likely to kill it?

I can spray with glypho, inject,cut,dig, burn etc etc. What do you reckon?

 

It is only very small but I want rid of it now.

[detritus21]

Glyphosate mix it mega strong and repeat treatments. We mix at 800ml gallup biograde to 15l of water. It is about the max that is recommended

[TGB]

Try a gander through these:

http://arbtalk.co.uk/forum/showthread.php?t=32947

 

http://arbtalk.co.uk/forum/showthread.php?t=72386

 

http://arbtalk.co.uk/forum/showthread.php?t=47208

 

http://arbtalk.co.uk/forum/showthread.php?t=46680

[RobRainford]

Spray it in autumn with a strong glyph mix. Will take a few years for full control and eradication

[treesrus]

defo glyphosate, it's the only thing that works - dig it up and you'll leave roots behind that come up again years later. spray foliage and inject stems ( i use a syringe that you get with printer cartridge refill packs for small amounts or a sheep vaccinator for larger infestations)

[Stephen Blair]

Were did you put the bit you pulled out?

 

Strong round up will do it, keep hitting it when it's leaf is at it's largest.

[Peasgood]

Try a gander through these:

Japanese Knotweed - Arbtalk.co.uk | Discussion Forum for Arborists

 

japanese knotweed removal - Arbtalk.co.uk | Discussion Forum for Arborists

 

Japanese Knotweed and Invasive weeds - Arbtalk.co.uk | Discussion Forum for Arborists

 

Knotweed Pricing - Arbtalk.co.uk | Discussion Forum for Arborists

 

Having gandered through those I now know you should use glyphosate because Roundup contaminates the ground. (they are both the same thing!)

Injecting with neat antifeeze works but red diesel doesn't.

20 litres per hectare is the required glyphosate rate but anything above 5 litres is illegal and you are better off buying it off a farmer because they use stronger stuff. (I'd say 360 is about the same strength whoever you are)

 

Having filtered through what I can, I am going to spray the foliage with a strongish mix of glyphosate, a week later i will cut and bag the foliage and burn it and inject the stems with a 50% mix of water:neat glypho. The stems will be a bit shorter than recommended 18" because the plant isn't much bigger than that.

Any regrowth this year will get a good dose of something I probably shouldn't have.

 

Is this OK?

[woodyguy]

Once you've done that, put a thick layer of polythene and something on top of that. I put a tonne of horse manure but soil or woodchip would be fine. That's what finally got rid of mine (as well as glyphosate) after 5 years.

[Steve Bullman]

tordon 22

[NickinMids]

tordon 22

 

Been withdrawn....as has Timbrel/Garlon but there's a new product called

Ikade or Icade available from Rigby Taylor which they say works. It's still got Triclopyr and something else in it