jap knot weed

[Brett]

we are moving into a new yard, had the back area scraped and bunded. on Tuesday i noticed jap knot weed sprouting up through the mounds.

 

Will hitting it with glyphosate from a knapsack repeatedly be enough or will it need stem injected??

 

Also thought about painting straight onto leaves, whats the most effective way?

 

Cheers

[wadhill1]

Glyphosphatewill do it, spray regularly. The most effective dose is just after it has flowered but seeing as its early in the growing season probably better spray asap.

1 useful tip - when you mix it in the knappsack spray put 2 or 3 drops(and i mean just drops) of washing up liquid in the mix it helps it to coat the plant better.

[Brett]

grand, cheers mate.

[peatff]

There's some over the wall from us and I jump over and give it a shot when it is about a foot tall and again at the end of the season when it is powering up the rhizomes for winter and it seems to be working, I have it back to about 20 feet from the wall now. I'll try the washing up liquid in the mix when I go over again.

[Arborist]

The company I have been working for give it two sprays a year, first in late may and then the second late summer august/September. Wait until the plant has established then spray coating the stems, and the top and underside of the leaves. After a few years once you see no regrow the cultivar the soil to encourage any regrowth and then spray again.

[Pinkfoot]

A mix of MCPA and glyphosate is effective.

 

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[Brett]

MCPA? eh?

[Pinkfoot]

It's a hormone chemical that is very effective on broad leaved weeds.

In a mix with glyphosate, they are very effective.

It's an old one and cheap but good.

 

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[Duncansimpson]

I sprayed some with a mix of roundup and garlon and it knocked it for six but returned following year. I treated it for 4 years but it still came back.

Finally another company sprayed it and it was gone in a year never to return. I'd love to know what they used!

Someone said don't use too strong a mix as a weaker mix gets taken further into the roots. I tried injecting between the nodes with 10% mix of roundup but death stopped at the first node!

[gooseflight]

SBK sickens it. I'm going to try an SBK/glyphosate mix.