Mark Williams <[log in to unmask]> wrote (in <Law14-F112yAkughpYM000215
[log in to unmask]>) about 'Japanese Knotweed', on Fri, 18 Jul 2003:
>One of our sites has had Japanese Knotweed identified on it. We have
>contacted DEFRA, The Environment Agency, The Local Authority and English
>Heritage but nobody seems to know how to deal with the problem and
>not from an archaeological perspective. It is in an archaeologically
>sensitive area and an area scheduled for development in the very near
>future. It is my understanding the only way to deal with the Knotweed is
>dig a very big hole and indeed would be an offence under the 1981
>Countryside act not to.
>If anyone one has had a similar problem I would be very grateful if they
>could contact me.
A Google search turned up this from a US Government site:
CURRENT MANAGEMENT APPROACHES: Grubbing is effective for small initial
populations or environmentally sensitive areas where herbicides cannot
be used. Using a pulaski or similar digging tool, remove the entire
plant including all roots and runners. Juvenile plants can be hand
pulled depending on soil conditions and root development. Any portions
of the root system not removed will potentially resprout. All plant
parts (including mature fruit) should be bagged and disposed of in a
trash dumpster to prevent reestablishment.
Cut stem treatment: Use this method in areas where plants are
established within or around non-target plants or where vines have grown
into the canopy. This treatment remains effective at low temperatures
as long as the ground is not frozen. Cut the stem about 2 inches above
ground level. Immediately apply a 25% solution of glyphosate (e.g.,
Roundup, or use Rodeo if applying in or near wetland areas) or triclopyr
(e.g., Garlon) and water to the cross-section of the stem. A subsequent
foliar application of glyphosate may be require to control new seedlings
Foliar spray method: Use this method to control large populations. It
may be necessary to precede foliar applications with stump treatments to
reduce the risk of damaging non-target species. Apply a 2% solution of
glyphosate or triclopyr and water to thoroughly wet all foliage. Do not
apply so heavily that herbicide will drip off leaves. A 0.5% non-ionic
surfactant is recommended in order to penetrate the leaf cuticle, and
ambient air temperature should be above 65 ºF.
USE PESTICIDES WISELY: ALWAYS READ THE ENTIRE PESTICIDE LABEL CAREFULLY,
FOLLOW ALL MIXING AND APPLICATION INSTRUCTIONS AND WEAR ALL RECOMMENDED
PERSONAL PROTECTIVE GEAR AND CLOTHING. CONTACT YOUR STATE DEPARTMENT OF
AGRICULTURE FOR ANY ADDITIONAL PESTICIDE USE REQUIREMENTS, RESTRICTIONS
NOTICE: MENTION OF PESTICIDE PRODUCTS ON THIS WEB SITE DOES NOT
CONSTITUTE ENDORSEMENT OF ANY MATERIAL.
This is just the first of 9310 hits for 'Japanese knotweed'.
I hope you find an acceptable solution.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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