Mapping Knotweed Species Along Rivers in the District of North Vancouver

  • Mara Zanette University of Victoria


Invasive plants reproduce rapidly and spread aggressively, dominating natural areas and altering biological communitieis; between these, knotweed spp. are one of the 100 worst invasive species. To help manage, prevent, treat and control invoasive plants, the District of North Vancouver (DNV) prepared the Invasive Plant Management Strategy (IPMS). One of the objectives of the IPMS is to develop and maintain an invasive plant inventory that provides the information required to make informed decisions regarding invasive plant management. To gather the information needed for a knotweed spp. inventory I used the protocol established by the Invasive Alien Plant Program (IAPP). The result was a map of the actual presence of knotweed spp. along DNV rivers.

The map shows a reductin of knotweed spp. presence along Mosquito Creek and MacKay Creek, however some upper part of these creeks are still overrun by knotweed spp. The greatest occurrences were detected in the lower par tof Lynn River and in a spot along Capilano River. Future challenges will be how to deal with knotweed spp. close to rivers where glyphosate cannot be used, however classical biological control are now tested in the UK and Us with excellent results.

Technical Papers