Japanese knotweed – The Property Care Association (PCA) and Bohemica

Thursday 8th December 2016

The Knotweed Company is a proud member of the PCA’s Invasive Weed Group and have always offered a great deal of support in the Invasive Weed Group and have heavily contributed to the development and running of both the surveyor and technician training and examination qualifications. We employ four qualified Surveyors and all our operational staff either hold the Surveyor or the Technician qualification.

We recently attended the PCA’s annual conference on invasive weeds, which had many excellent presentations and I have to say that I learnt something from every speaker! It is excellent to see presentations on new and old subjects, and also very importantly we are seeing the release of scientific trials on Japanese knotweed – I think that this is the first time we have seen the results of a large field experiment being released – all credit to those involved.

We were very interested to learn that the Bohemica hybrid may have a different Chromosome count depending on its parentage. Bohemica is a hybrid caused by the hybridisation of Giant knotweed and either compact Japanese knotweed or Japanese knotweed. We are currently seeing a number of sites with Bohemica, and these appear to be mainly within an area which may be defined as having its corners in Oxford, Bletchley, Bicester and Aylesbury. We have now identified more Bohemica in this area than Japanese knotweed!

The Bohemica hybrid requires treatment in slightly differing ways to Japanese knotweed and is often a more difficult plant to kill using herbicides, as it is very persistent and quite resistant to the herbicides that are now available to us. We are able to utilise our knowledge of this plant (going back more than 10 years now) and can modify our programmes to take advantage of the plant’s weaknesses.

With staff covering all of England & Wales, speak to the professional Japanese knotweed Company about your knotweed problems, contact us on 01327 703129 or 01962 886060 or email us on enquiries@jkweed.co.uk or sharon@jkweed.co.uk