ECO-WARRIORS will get tips on how to combat some of the worst alien invaders to ever reach these shores at a special event in Londonderry on Monday (June 11).
Guest speakers from Inland Fisheries Ireland and the Scottish Rivers and Fisheries Trust will be able to answer queries on how to identify and control Japanese knotweed, Giant hogweed and Himalayan balsam.

The pests are classified as amongst the 100 worst non-native invasive species in the world……. Londonderry Sentinel…..13/06/12… full article…