Japanese Knotweed Treatment & Control
Herbicide is the most cost effective Japanese Knotweed treatment and control method.
Although a much slower method than the excavation of Japanese Knotweed, a herbicide treatment is an economical method of controlling this tenacious plant. Landtech (UK) Limited have a team of NPTC and BASIS qualified technicians. These qualifications are a legal requirement for giving advice on applying herbicides. In addition, we offer a 10 year insurance backed guarantee with all Japanese Knotweed treatments to satisfy mortgage lenders.
Japanese Knotweed Herbicide Treatment
- Requires one herbicide application per annum. *
- Application must be carried out between mid-July and the end of October.
- Control generally takes a minimum of 3 years, with a verification period of two years before the land can be reused.
- Spray operatives must hold the appropriate NPTC qualifications for the safe use of pesticides.
- Environment Agency or SEPA consent must be obtained if applying a herbicide on or near water. (Not required in Wales if the contractor is suitably qualified).
- It is a ‘Food & Environment Protection Act’ offence to give advice on the use of herbicides without holding the appropriate BASIS qualification.
- Following a herbicide treatment program, viable rhizome may be still be present particularly at depth even when no plants are present on the surface. Therefore, the ground should not be disturbed during the guarantee period.
* Normally only one application per annum is required between August to the end of October. More than one application per season would only be justified in exceptional circumstances or where the ground is being repeatedly cultivated to stimulate growth. Incorrectly timed applications may lead to poor levels of control and extend the time needed to control the plant.
Treatment & Control Methods
Foliar Spray Application – This is normally the most economic, killing 95% of plants in the first year.
Stem Injection – This involves injecting the stem with a herbicide using a specialist gun. This method is highly effective but rarely justifies the cost over foliar spray except over small areas or areas where other vegetation needs to be preserved.
Stem Filling – This involves cutting the Japanese Knotweed off just above the first node and filling the hollow stem with herbicide. This is a very effective technique but disposal of the cut green stems can often prove expensive.
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