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Warning of more sightings of hazardous moth caterpillar in Woking

4 minute read
Warning of more sightings of hazardous moth caterpillar in Woking

Published by Carol Musgrave at 12:56pm 3rd July 2020. (Updated at 1:01pm 3rd July 2020)

Woking Borough Council has issued a reminder not to touch a hazardous tree pest - as more of them are spotted in the area.

The Oak Processionary Moth caterpillar can cause rashes and throat irritation, and can cause breathing difficulties in people and pets.

The caterpillars, which have been in the UK since 2012 with infestations found in London and parts of the South East in recent years,  have black heads and bodies covered in long white hairs. 

They can be identified by their dome or teardrop-shaped nests in trees, which range in size from a ping pong ball to as large as a rucksack. 

The nests are white when fresh, but soon become discoloured and brown.

May to July is the greatest risk period when the caterpillars emerge and feed before pupating into adult moths.

The caterpillars feed on oak leaves, which can leave the trees vulnerable to other pests, diseases and drought.

The council says the Forestry Commission has a programme to tackle the pest and if you see one, to report it.

Cllr Kevin Davis, Woking Borough Council's Portfolio Holder for the Environment, said:

"Where the caterpillars or their nests are identified on public land, the Council follows Forestry Commission guidance to deal with the infestation. 

"Meanwhile, we continue to urge residents not to touch the caterpillars if they believe they have found a nest and to make sure you look after your pets as they can also be affected.

"All sightings of caterpillars and nests on either public or private land need to be reported to the Forestry Commission, which has a programme in place to tackle the pest."

  • What to look out for:
  • OPM moths, the adult form of the species, are undistinctive brown moths similar to other species, and are difficult to accurately identify. They are not a health hazard and do not need to be reported unlike their junior forms.
  • OPM caterpillars have a distinctive habit of moving about in late spring and early summer in nose-to-tail processions, from which they derive their name. They live and feed almost exclusively on oak trees and can sometimes be seen processing across the ground between oak trees. They have very long, white hairs which contrast markedly with the much shorter, almost undetectable irritating hairs; have a grey body and dark head. Older larvae have a central dark stripe with paler lines down each side.
  • OPM nests are built in early summer on the trunks and branches of oak trees. They are made of distinctive, white, silken webbing and are accompanied by white, silken trails. These become discoloured after a short time and more difficult to see as a result. Several nests can occur on the same tree or branch, anywhere from ground level to high in the oak tree.

Report a sighting of OPM here, or email opm@forestrycommission.gov.uk or call 0300 067 4442. 

You will need to give a precise location as to where the infestation was sighted and, if possible, provide a photo.