jap knottweed

[Johny Walker]

I was referring to soil sterilisation by heat treatment

 

as in ??

[daveatdave]

I think heat treatment could be a problem as the roots can go down over 12 ft.

[Gary Prentice]

Seen the root tubers regrow being burnt on a bonfire. Doesn't it come from volcanic soils?

[Mick Dempsey]

I've told this story before but....

I had a mate out here who owned a property with knotweed.

I gave him all the horror stories about how invasive it is, difficult of eradication etc.

He just cut it with a strimmer then planted grass seed, kept mowing and it disappeared.

I would say bamboo is a bigger issue.

[MATTMOSS]

Try a product called icade.

Obviously need to read up on it to make sure it suitable for your area, but I have been told it's good stuff.

[RobRainford]

stem inject now with neat glyph, will give good control. Tordon works well too but think thats out of production now.

 

As said, if spraying mix at 20ltr/ha and do it in autumn.

[Starscream]

If only they still sold caseron g!! Anything with mecoprop or 2,4d is really good. These chemicals are found in the selective herbicide they use on lawns that targets weeds and not the grass. There's a product called 'react' that we use to treat lawns. This is more effective on knotweed, in my experience, than glyphosate. Caseron g was a pre emergence herbicide that created a barrier and anything that grew through it was destroyed. You can prob still get some sort of pre-emergence chemical. If you can, get some of that down too.

[Arctostaphylos uva-ursi]

If its just a couple of stems it should be fairly easy to kill off. I treated some large colonies. In the first year I used a weedwiper and the second a foliar spray at the normal prescribed concentrations. Seems to have done the trick.

If it is just a couple of stems it should be possible to dig it up. Pass all the soil through a riddle to make sure you get all the rhizomes and then burn hang it out to dry and burn it.

[openspaceman]

as in ??

 

Soil re mediation on contaminated sites, like old gas works, is sometimes dome by heating soil up. Greenhouses used to do something similar by hauling a plough which was steam heated through the beds. I doubt there are many plants or seeds that can survive being heated to 70C for and hour and if heat losses are contained it takes a surprisingly small amount of heat to get to that temperature, I haven't run the figures recently but IIRC it was about 70kW(t) for 24hrs to treat 20 tonnes.

 

I knew a bloke that treated JKW on the olympic site using glyphosate for quite a few years and it's still re occurring.

 

On a similar site they decided to dig all the contaminated soil and bury it in a terram lined cell , all 4 metres below the surface, I never did see if that worked.

[Chris3King]

Use glyphosate it will keep you in work!