CONTROLLING WEEDS TREATMENT OPTIONS
The following are just some of the main treatment options available. Knotweed Eradication's treatment programmes are tailored to suit the individual site and may consist of a mixture of treatment methods depending on the requirements of the development.
Japanese Knotweed has few if any natural enemies in this country, and while this could eventually become the preferred option, it would, at best, control the plant but not eradicate it.
Research into this option is on going but is not likely to produce a realistic solution for many years.
Regular cutting or pulling will eventually exhaust the plant into submission. However the time scale, labour and cost involved make this method unviable in the majority of cases.
This treatment method consists of delivering a high dose of glyphosate based herbicide directly into the Japanese Knotweed stem. The method is not weather dependant and directly targets the specific plant species without harming surrounding vegetation
The treatment method is highly labour intensive as every single Knotweed stem needs to be injected and is only really suited to smaller infestations within areas of desirable vegetation such as managed flower and shrub beds. A specialist applicator gun is also required.
Herbicide Spray Treatments
The most commonly used method of applying herbicides which can be an extremely effective treatment on larger areas of infestation down to spot treatment of individual plants. This method offers a broader range of potential herbicides though care should be taken and advice sought from a BASIS Qualified Advisor.
This method of treatment can be affected by the weather and applications should only be carried out by NPTC qualified personnel.
On Site storage
Where treatment cannot be carried out in situ due to the location of the infestation or the timescale of the development infestations are excavated and removed to an on site storage location for further treatment, usually by means of herbicide spraying. Once treated material can be utilised back into the site.
This treatment option adds additional cost to the standard herbicide spray treatment, however it often means development can continue unhindered providing there is sufficient room to store material within the site.
On Site Burial
Where sufficient storage areas are not available on site for on-going herbicide treatment it may be possible to create a burial cell. The cell is lined with a specialist geomembrane, such as Cutex into which the excavated Japanese Knotweed is placed and encapsulated.
This option requires excavation of a suitable cell area ideally away from areas of any future ground works or the locations of any services. Liaison with the local Environment Agency officer will also be required to ensure the material is suitable to be buried and the area plotted onto a site plan for future reference.
Excavation and Removal
Where there is insufficient space or time to allow for on site treatment options it is possible to excavate and remove Japanese Knotweed material to licensed landfill facility. This is often referred to as 'dig and dump'.
Many contractors will blindly quote the Environment Agency 7m X 3m guideline which will result in a huge volume of material being removed at great expense to the client whereas a considered approach and supervised excavation by experience personnel will chase the Knotweed plant out and can significantly reduce this volume sometimes by up to 90%.
Japanese Knotweed is a controlled waste and care should be taken that appointed contractors carry the appropriate waste carriers license and that waste transfer notification is provided showing the appropriate EWC code, site of origin, waste carrier, disposal facility and that the document is signed by the appropriate persons.