The introduction of 450 insects into the town’s canal network will see the adult weevils eat away at the plant leaves. Females will also lay eggs on the plant’s stalks, with larvae then boring into the stems, damaging the structure of the plant.
This innovative way to help control pennywort in Thamesmead is being carried out by Peabody in partnership with Thames21, CABI and the environment agency. Improving and caring for the town’s landscape is a key part of our plan to improve, grow and look after Thamesmead for the long term.
Managing pennywort is vital. Left untouched, it forms thick mats over the surface of the water, reducing the oxygen levels needed for native plants, fish and invertebrates to thrive. It also disrupts recreational activities like boating or kayaking, and increases flood risk.
The waterborne critters will complement the work of our environmental services team, who clear a massive 60-70 tons of pennywort a year. The weevils’ progress will be monitored by the Environment Agency, who will be continually testing the quality of the water.
Want to help keep our canals clear?
Over the coming months we’re inviting volunteers to pull on a pair of waders and join environmental experts in removing pennywort from other parts of the canal network. Check our What's On page for the latest activities.
Like to get involved? Find out more, including how to sign up, here.