Herbicide Treatment of Japanese Knotweed

Japanese Knotweed Treatment

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Our Japanese Knotweed Treatment Programmes provide professionally managed and executed herbicide treatment via knapsack spraying, stem injection and leaf-wiping.

Japanese Knotweed Treatment Programme

A Herbicide Treatment Programme involves a methodical programme of carefully managed visits, where correctly specified and used herbicides are applied to the target plants. With sustained applications, the herbicide can exhaust the plant bringing it under effective control and preventing its further spread.

Japanese Knotweed Treatment Plan

Studies have shown that there are optimum herbicides and techniques that should be adopted for the best results and our methods adhere to these findings. We adapt our methods and herbicide uses subject to site logistics. When planning a Japanese knotweed treatment programme, we consider:

  • The proximity of Japanese knotweed to watercourses and bodies (inc the sea
  • Sensitivity to non-target vegetation (trees, plants and grasses) growing in the vicinity
  • Size of the infestation and density of the stand
  • Proximity of tree roots
  • Proximity of badger sets or other species of protected wildlife

This enables us to determine the best choice of herbicide and the best method of application, which would be one or more of the following:

  • Knapsack sprayer
  • Stem injection
  • Leaf wiping

Japanese Knotweed Control - Limitations of Use

In most situations (particularly with mature knotweed stands that possess visible crown material) herbicide control alone is unlikely to remove the viability from all of the plant's underground rhizome system.

Dense or deep rhizome may retain viability while being locked in a herbicide induced dormancy. Disturbance of the treated knotweed area even after successful completion of herbicide treatments can therefore result in re-growth. If the area of ground where the knotweed resides is likely to be disturbed a remediation method involving physical extraction via excavation will be required, rather than in-situ herbicide treatment.

Legislation and Certification

There is a substantial amount of legislation concerned with the use of herbicides. Examples include the Control of Substances Hazardous to Health Regulations (COSHH) 1988 and the Code of Practice for Using Plant Protection Products 2006. The control of herbicide regulations can be found within the Food and Environment Protection Act (FEPA) 1985.

It is also a requirement that any intention to apply herbicide within 5-10 metres of a watercourse must not be carried out until written confirmation has been received from the Environment Agency. We undertake and obtain E.A. licenses to apply herbicide on or near water where required.

The application of any herbicides should be carried out in accordance to a BASIS guarantee and by persons with a recognised National Proficiency Test Council (NPTC) Certificate of Competence. This ensures the right herbicides are used and applied correctly. All our staff have the appropriate training and certification and conform to current legislation.

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