How do YOU deal with Japanese knotweed?

[SmartinMartin]

Spent the morning starting to tackle a 200m hedge rotten with it. First I punctured and injected all the big stems, then sprayed the lot (first 50m, will do all over a few days). Injecting is back breaking work, but supposed to be far quicker to kill it, goes straight to the roots. I'm hoping a combination of the two will do the job. This is war!
Any tips?

[8760976543]

[765489]

Spent the morning starting to tackle a 200m hedge rotten with it. First I punctured and injected all the big stems, then sprayed the lot (first 50m, will do all over a few days). Injecting is back breaking work, but supposed to be far quicker to kill it, goes straight to the roots. I'm hoping a combination of the two will do the job. This is war!
Any tips?

Your going about it the right way anyway smartmartin. And spraying at the right time when the plant is bringing nutrients back down to the rhizomes. Our local council done a stand on it after I reported it to them, not sure if the got a specialist contractor to do it or was their own lads but they sprayed it once and it hasn't come back since. I'd love to know what product they used as it was very effective. Never came up the following year and its 4 years now and still good. If I see any of them I'm going to ask them.

[SmartinMartin]

I've used round up on the first lot, gonna use Gallup next. Be interesting to see if there's a difference.

[dawg]

Spent the morning starting to tackle a 200m hedge rotten with it. First I punctured and injected all the big stems, then sprayed the lot (first 50m, will do all over a few days). Injecting is back breaking work, but supposed to be far quicker to kill it, goes straight to the roots. I'm hoping a combination of the two will do the job. This is war!
Any tips?

FWIW I had a small clump of it appear. Injected it. That really set it back. Three years later little outbreaks appeared so injected again. All good since ( over 10 years ).

Very glad I didnt have 200M to deal with

[SmartinMartin]

For anyone intending to inject the plant, I got a great tip from the chemists where I bought the syringes, which is to drill a small hole in the stem first, as the fibrous material will block up the needle if you try to push it in. I just ground a point onto a chainsaw file and punctured the stems with that.

[SmartinMartin]

Just an update, injecting the plant works wonders. 300 metres of dead root system;

[Memento Mori]

Great result. Will you rip it up now and burn it?

[Osciiboscii]

What did you use? I've a massive briar growing thru the hedge, and am planning climbing under and injecting each stem with Gallup.

[765489]

When did you inject the stems Smartmartin and did you go with Gallup in the end ?

[SmartinMartin]

I'll just leave it rot, Mori. The root system is gigantic on these plants, you'd never get it out.
I used roundup on about 200m and Gallup on the rest, both have been extremely effective.
I injected them 2nd week in August. Delighted with the result. Next spring I'll watch the patch like a hawk, and spray/inject again if necessary.

[SmartinMartin]

Reread your post Mori, you mean the dead stalks. I don't know what to do, I think I'll leave them till spring and see what happens.

[SmartinMartin]

Just an update:
checked the hedgerow yesterday and not one shoot showing anywhere. Injection is hard work but worth the effort. I'll monitor over the next couple of years.

[Scotty]

I've used round up on the first lot, gonna use Gallup next. Be interesting to see if there's a difference.

There shouldn't be. They're the same thing, Glyphosphate, and in the same strength. Roundup is a lot more expensive though!

[Setanta]

https://postimg.cc/TL6B93Cf


Trying to tackle this corner on an outside block with pigs,use it as a crop

[CelticRambler]

Sounds like a good idea ... maybe.

[678904673]

I dont know quite how to deal with it. But its certainly a problem that we need to get to the root off

[Calahonda52]

I'll just leave it rot, Mori. The root system is gigantic on these plants, you'd never get it out.
I used Roundup on about 200m and Gallup on the rest, both have been extremely effective.
I injected them 2nd week in August. Delighted with the result. Next spring I'll watch the patch like a hawk, and spray/inject again if necessary.

Are they the farm versions or the diluted consumer versions?
Thanks

[Setanta]

https://postimg.cc/k229nmJL


Some headway being made,I suspect the pigs may have been too small at start..

I don't overfeed em,but don't be hungry either,but want em to work and dig/eat at roots too

I'm intending to pull as much into bags for incineration the weekend as time is freeing up for me now......a quick work at the roots,gives some simple clarity as to how it got the name knotweed

[CelticRambler]

When I was a-walking in the Vosges earlier in the year, I came across an information board explaining that they were trialling a new knotweed control strategy. I'd noticed a lot of it lower in the valley on my way to my overnight parking spot, where the board was. The strategy was quite simple: slash it to ground level, cover the area with barrier membrane, then plant willow and pine through holes in the membrane, et voilà : sit back and wait. Supposedly willow and pine compete quite agressively with JK. The info board looked like it was at least a few years old, and there was no sign of any knotweed in the vicinity.

[Setanta]

When I was a-walking in the Vosges earlier in the year, I came across an information board explaining that they were trialling a new knotweed control strategy. I'd noticed a lot of it lower in the valley on my way to my overnight parking spot, where the board was. The strategy was quite simple: slash it to ground level, cover the area with barrier membrane, then plant willow and pine through holes in the membrane, et voilà : sit back and wait. Supposedly willow and pine compete quite agressively with JK. The info board looked like it was at least a few years old, and there was no sign of any knotweed in the vicinity.

some parts of my research into tackling this,I did come upon a study by an Irish student that suggested willow would kill roots of it too

To best of our knowledge this particular patch has grown uncontested since pre-WW2, as the remnants of a flower pot were dumped on a dungheap (and was actively planted elsewhere on this outside farm-yet to be tackled)

This patch was so thick,it was unfeasible to tackle it via injecting into the stems, unfeasible to cut with strimmers upto 30 inches of dead branches on the ground


And aswell,I prefer where feasible to have my own home produced food,but that will wait until next summer I'd say to see next plan.....hoping to kill it back to extent injecting stems would be possible and then plant a hedge of willow around it perhaps and return this particular corner to the growth of veg or MSS grass via reseed of field

[Apelles]

some parts of my research into tackling this,I did come upon a study by an Irish student that suggested willow would kill roots of it too

To best of our knowledge this particular patch has grown uncontested since pre-WW2, as the remnants of a flower pot were dumped on a dungheap (and was actively planted elsewhere on this outside farm-yet to be tackled)

This patch was so thick,it was unfeasible to tackle it via injecting into the stems, unfeasible to cut with strimmers upto 30 inches of dead branches on the ground


And aswell,I prefer where feasible to have my own home produced food,but that will wait until next summer I'd say to see next plan.....hoping to kill it back to extent injecting stems would be possible and then plant a hedge of willow around it perhaps and return this particular corner to the growth of veg or MSS grass via reseed of field

Its an interesting plant Willow, and is so easy to propergate. It loves to take root in nearly any type of soil conditions. It grows a strong, hungry dense root system that I guess chokes the Japanese knotweed, starving it of any nutrients.
As it's nearly the right time of year and I'll soon be cutting back my willow bushes. I use a piece of rebar and a mallet to make a hole about a foot deep and push the withy in.

This video gives a good insight into when and how to take willow cuttings then planting them.
There's a short time lapse bit near the end showing how much a cutting grows in 25 days.