Manningtree, Brantham Felixstowe Chelsmford
Braintree Clacton. Frinton Hadleigh Woodbridge
The stem injection spray method ensures that only the plant targeted is treated, so that other more desired foliage can be kept and given the chance to thrive once again. The stem injection delivers a calibrated dose of herbicide directly into the bottom node of the stem, ensuring the herbicide is delivered to the crown and root system (rhizome) with no native species being affected. It can be particalary affective if the Japanese Knotweed is near a water course or if it is growing adjacent to specimen plants that you don't want to be affected by spraying a systemic translocating herbicide.
Vertical root barriers are used to minimise the risk of an infestation from an adjoining property spreading across the boundary. Other uses of root barriers - are to protect buildings or structures from being damaged ‐ particularly to line foundations if knotweed is in the vicinity. However although vertical barriers comply with Environment Agency recommendations, this method would only be advisable used in conjunction with an appropriate herbicide programme.
More suited towards new build schemes and construction projects, Japanese Knotweed excavation and removal solution removes the constraints of the typical length of time a knotweed herbicide treatment may take by using plant machinery to physically excavate the infected soil due for development. A temporary or permanent bund can be created on-site if space permits where the infected soil can be treated with a herbicide programme. Or the soil can be removed completely by transporting the Japanese Knotweed to a licensed landfill site. Due to this soil be categorised as controlled waste (Environmental Protection Act 1990) the costs associated with this method can be very expensive.
Herbicide treatment is applying herbicide to Japanese Knotweed in situ. It is the most cost effective means of treating Japanese Knotweed and can quickly reduce the capacity of the plant to spread.
However it can takes years to achieve acceptable results as management plans must include at least 2 years of monitoring after all evidence of regrowth has stopped.