Japanese Knotweed Removal
By Samantha Quinn
July 28, 2010
I was reading the letters regarding the Japanese knotweed problem
some are having and found this information on Wikipedia.com on
it's removal. I hope this helps!
Taken directly from http://en.wikipedia.org/wiki/Japanese_knotweed:
"Japanese knotweed has a large underground network of roots
(rhizomes). To eradicate the plant the roots need to be killed.
Picking the right herbicide is essential, as it must travel through
the plant and into the root system below. Glyphosate is the best
active ingredient in herbicide for use on Japanese knotweed as
it is systemic ; it penetrates through the whole plant and travels
to the roots. Glyphosate is available under several trade names
- all label the product as a "weed and grass killer".
Commercial glyphosate concentrates contain approximately 20%-40%
glyphosate; the balance is mostly water. Such concentrates need
to be diluted in water.
The most effective spraying solution contains about 5%-10% glyphosate
in water. (To make a 5% solution from a 40% concentrate mix 1
part concentrate with 7 parts water.) Ready-to-use solutions
that contain less than 5% glyphosate are too weak and do not
work. A small amount of liquid dish-washing detergent can be
added to improve wetting of the leaves. If possible, both sides
of the leaves should be sprayed until they are completely wet.
It takes about 3 weeks for most of the plants to die. After 3
weeks, all remaining plants should be sprayed again. This process
needs to be repeated until all the plants die.
The US federal government will come and spray Japanese knotweed
for no charge in many areas under the Invasive Species Act. Local
county extension agencies can be contacted for more details.
More ecologically friendly means are being tested as an alternative
to chemical treatments. Soil steaming involves injecting steam
into contaminated soil in order to kill subterranean plant parts.
Research has also been carried out on 'Mycosphaerella leafspot
fungus, which devastates knotweed in its native Japan. Research
with Mycosphaerella, has been relatively slow, due to its complex
In the UK, where over £150M is spent annually on Japanese
knotweed control, a decision was taken on 9 March 2010 to release
a psyllid insect, Aphalara itadori. Its diet is highly specific
to Japanese knotweed and shows good potential for its control."
"Weeders" are the
absolute best in controlling & eliminating weeds. Brown China
Geese are non-toxic and are big, lovable pets. Mint farmers have
used these amazing creatures for years as weeders. They would
require care -- more work than toxic chemicals but more rewarding.
Received July 27, 2010 - Published
July 28, 2010
about Japanese Knotweed By Melinda Stewart
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