Updated by Simon Kirby
The project to control and eradicate Japanese Knotweed from
the Dukes Meadows area will be long term.
Our research to establish the most effective treatment has lead us to conclude that the use of herbicide will be the best course of action.
There are a number of different herbicides available, however the proximity of the River Thames precludes the use of many of them.
The Environment Agency recommend the use of Glyphosate  this involves a twice yearly spraying of the Knotweed in early Spring and late Autumn.
Simon Kirby from the FoDM Inspecting the sprayed Knotweed
between Chiswick and Barnes Bridges. Photo taken early November 2001
Our action plan was presented to Hounslow's Community Initiative Partnership (CIP) and the Environment Agency this year,
which has resulted in the first spraying taking place in October 2001. The CIP instructed an outside contractor to undertake
the spraying and the initial results appear promising.
The key to the success of the project is for the Knotweed to take the herbicide down the plant into the rhizomes, which can
reach a depth of 2 metres and extend up to 7 metres away from the parent plant. The characteristic of the plant's extensive
rhizome system is one of the reasons why Japanese Knotweed is so difficult to eradicate! The next step will be to clear the
dead stems in Feb/March 2002 leaving clear access to spray the new shoots in early spring. This will be another major task
we will cover in the next update.
Once the Japanese Knotweed is under control one of the best methods to reduce the risk of re-infestation is to replant the
area. As a note of reassurance, planting schemes form a major part of the FoDM's plan to rejuvenate Dukes Meadows area.
If you would like further information on Japanese Knotweed and its treatment, one of the best websites is that of the
"CABI Bioscience.org"
First phase of spraying completed
Japanese Knotweed Update 2001 + 2003
Back to Event and Project Archive
September 2003 update.
The Fourth spraying has just been completed across the affected areas on Dukes Meadows. So far we've been get very good results with our project to control the Japanese Knotweed. The dead stems have been cleared away from the affected areas, and local people have been reporting back to us, "That its nice now, we can see the River again"    as before the Knotweed obscured the view of the Thames from the towpath for many years.
+ 2003 small update (below)
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