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  Niall Hamilton July 13, 2014 at 8:12pm

  I used to treat lots of Japanese knotweed for the company I used to work for, we just used Barclays Gallup injecting the stems or spraying where it was allowed.
  Since I've been out on my own I've only I've treated some at a block of flats I look after, just sprayed it last year soaked it with Gallup and it did a good job, only one new shoot this year.
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  adrian July 13, 2014 at 8:45pm

  Thanks Niall but would that kill the grass around it too? Is it selective?
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  Niall Hamilton July 13, 2014 at 8:57pm

  Yes it will kill the grass, you could just be careful when spraying. You can always fix the grass later with seed. Most of the areas I treated where commercial sites or at the the rear or side gardens where the grass wasn't a problem asking as there isn't a strong breeze when your spraying you should be fine.
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  David Benson July 13, 2014 at 11:43pm

  as Niall says don't worry about the grass or other plants that can be rectified after, the main job is getting rid of JKW
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  David Cox July 14, 2014 at 12:37am

  As others said, saving grass is not really worth worrying about, the JKW will do so much damage long term, that nothing else matters.

  Personally I had excellent results with Generic Glyphosate followed by re-growth sprayed with Tordon 22k.

  I used tordon as first treatment on a small stand in 2013 (june), and it was gone by end of August, no sign yet of a reapearance.

  All were done as foliar spray, no step injection.
  Glyphosate mix strength was 36g/l, (100ml of concentrate in 1l water).
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  Agrigem - Sarah Kimm July 14, 2014 at 9:46am

  Adrian, we have a product which is completeley selective and will do a great job on the knotweed, as well as many other tough weeds such as bramble & marestail. Its called Broadshot and it is avilable in a 1L or a 5L container. It also has amenity turf approval so it's a useful product to have.

  http://www.agrigem.co.uk/broadshot.html

  Give me a call if you want to discuss it in more detail.

  Cheers, Ollie.

  0800 1337849
• PRO Supplier

  Progreen Weed Control July 14, 2014 at 11:00am

  Hi Adrian,

  If you go down the glyphosate root, which is pretty much the popular option, and you want to know more we've a page on our website about How to control Japanese Knotweed

  The other sites that are worth looking at are the government website Government Guidance on Invasive Weeds
  and the RoundUp ProBiactive 360 difficult weeds website is also helpful too RoundUp - Japanese Knotweed

  For a selective our options for amenity situations are Kaskara or Blaster Pro (which has a higher level of triclopyr) - these come in 1lt (you get more coverage on Blaster Pro). 
  
  For use in paddocks Grazon Pro has proved highly effective for some of our customers.

  Hope this helps as well.

  Louise

  0800 032 6262

  www.progreen.co.uk
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  Graeme @ BGS July 14, 2014 at 6:40pm

  I can highly recommend Broadshot and can confirm it doesn't harm the grass sward
• PRO

  Robbie August 25, 2014 at 7:38pm

  
  

  Was looking at a hedge today and came across what i believe to be Japanese knotweed.

  Am i right in thinking, i can cut the stems and place them on root membrane to dry out then burn them onsite at a later date and stem inject the base of the plant with roundup?

  And then follow that up in the spring with another treatment?

  What spraying ticket do you require for using stem injectors?
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  Agrigem - Sarah Kimm August 26, 2014 at 8:43am

  Robbie, stem injection is covered by pa6 (hand held applicators). In this situation you have no other option but to inject as the risk of spray drift onto other plants is very high. When injecting, it is important to use a product which has the correct approval, and from a safety point of view i would go with one which has a clean label as you will be working in very close vicinity to neat chemical.

  Roundup Pro Bio - Use at 2ml per stem

  Roundup Pro Biactive 450 - Use at 1.6ml per stem

  Give me a call if you need anything else.

  Thanks, Ollie