Management, Control and Treatment of Japanese Knotweed
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The way to control Japanese Knotweed depends on how long the affected site has to be declared clear of knotweed. But control and containment on site is now the preferred option and is tax efficient. Please take advice from an accountant by visiting this website: http://www.hardcastle-burton.co.uk or emailing : peterh@hardcastle-burton.co.uk
In practice, this can be a number of years as the roots can remain viable for up to 20 years if they are disturbed – adding large, often unexpected, costs to a development site.
Control needs to start as soon as possible. In the dormant season, the plant may not be visible if the site has been cleared of vegetation, so all development sites should be surveyed at the earliest opportunity.
This new technology offers the quickest and most cost-effective method of control, usually within one growing season.
Normally the cheapest method of control but usually takes three years of continued repeat sprays.
Knotweed spraying can usually take place only in the growing season of May to September. The site then has to be monitored for a minimum of five years after any viable plant material is found.
The quickest option on a development site, but also the most expensive. This option removes the whole area of contamination to a waste disposal site or a more suitable area of the site.
Important: All information on the infestation, and the work to eliminate it, must be passed to future owners, including site management plans. See Our Services page.
National Trust
Camborne School of Mines (Exeter University)
CETOS
CABI Bioscience
RHA
Monsanto UK
Nomix Enviro
Dow UK
Environment Agency
DEFRA
PSD
In practice, this can be a number of years as the roots can remain viable for up to 20 years if they are disturbed – adding large, often unexpected, costs to a development site.
Control needs to start as soon as possible. In the dormant season, the plant may not be visible if the site has been cleared of vegetation, so all development sites should be surveyed at the earliest opportunity.
Japanese Knotweed Treatment Options
Stem Injection
This new technology offers the quickest and most cost-effective method of control, usually within one growing season.
Spraying
Normally the cheapest method of control but usually takes three years of continued repeat sprays.
Knotweed spraying can usually take place only in the growing season of May to September. The site then has to be monitored for a minimum of five years after any viable plant material is found.
Whole area removal within the site or to controlled waste site
The quickest option on a development site, but also the most expensive. This option removes the whole area of contamination to a waste disposal site or a more suitable area of the site.
Important: All information on the infestation, and the work to eliminate it, must be passed to future owners, including site management plans. See Our Services page.
References
National Trust
Camborne School of Mines (Exeter University)
CETOS
CABI Bioscience
RHA
Monsanto UK
Nomix Enviro
Dow UK
Environment Agency
DEFRA
PSD
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