Residents urged to stay clear of oak processionary moth

Published date
22 May 2026
Environment and neighbourhoods

Residents are being reminded to stay vigilant and avoid contact with oak processionary moth (OPM) caterpillars and their nests, which can pose risks to both people and pets.

Oak processionary moth nest on a tree trunk

The caterpillars are active between late spring and early summer and are most commonly found on oak trees. They are identifiable by their distinctive nose-to-tail ‘procession’ movement and the silky white nests found on trunks and branches.

Whilst small, these caterpillars can cause irritation. Their tiny hairs contain toxins that may lead to itchy skin rashes, sore throats, breathing difficulties and eye irritation if touched or inhaled.

Residents are advised to:

  • avoid touching or approaching caterpillars or nests
  • keep children and pets away from affected trees
  • not attempt to remove nests themselves.

Cllr Ellen Nicholson, Woking Borough Council’s Portfolio Holder for Green Spaces, said: “We understand that sightings of the oak processionary moth can be concerning for residents. Whilst the risks are generally low if you keep your distance, it’s important that people know how to recognise the caterpillars and what to do if they see them.

“If you do spot them, please avoid contact and report the sighting so their nests can be removed safely. By reporting sightings and keeping a safe distance, residents can play an important part in helping the relevant authority manage the issue.”

Residents that come across an OPM nest should report it to the appropriate authority.

When reporting, please give the precise location of where you saw the nest and, if possible, provide a photo.

Find out more about the oak processionary moth on the Forestry Commission website.