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Dealing with invasive non-native plants: the need for guidance on risk assessment

18 October 2018, London

The outcome of the workshop, hosted by AECOM at Aldgate Tower, heralds much needed guidance for those dealing with invasive non-native weeds to ensure these weeds are only controlled when they pose unacceptable risk. These plants include Japanese knotweed, Himalayan balsam and giant hogweed. This is good news for the environment, reducing unneeded damage, and for developers by helping to remove unnecessary constraints to projects.

The workshop was jointly organised by the CIEEM South East Section Committee, the Invasive Weed Control Group of the PCA and the London Boroughs Biodiversity Forum.  The workshop was attended by 58 ecologists and weed control specialists ranging from ecology consultancies and water companies to local authorities and contractors. The event organiser was Craig Llewellyn, AECOM, Convenor of CIEEM’s South East Committee and Max Wade, AECOM, was invited to facilitate the workshop.

The outcome of the workshop was reported at the PCA’s international Invasive Weed Conference: Identification, Assessment and Response in November, with the intention of publishing guidelines in the New Year.


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