On 29/08/2014 11:28, Tom Gardner wrote:
Swansea University scientists trial knotweed killers

Swansea University scientists are conducting the largest field trial in
Europe to find new ways of killing Japanese knotweed.

The plant is one of the most damaging species in the UK and costs £8m a
year to bring it under control in Wales.

Carwyn Jones has been finding out more.

http://www.bbc.co.uk/news/uk-wales-28975734

Where I've seen it on public land the problem appears to be that the
authorities can't adopt a little and often strategy. They prefer the
annual blitz, which appears to be the least successful method.