Warning as toxic caterpillar nests discovered

People have been warned to stay away from areas of common land in Surrey as a council deals with high numbers of a type of caterpillar which can cause breathing problems for humans.

Elmbridge Borough Council is spraying a biological insecticide in parts of Ditton Common and Weston Green after oak processionary moth nests were discovered.

Hairs from older caterpillars can cause skin rashes, eye irritations, sore throats and breathing difficulties in people and animals, according to Forestry Research.

The first round of spraying began on Friday. Another round is required between 10-15 days later.

Large numbers of the caterpillars can strips oak trees of their bark which leaves them vulnerable to diseases and other pests.

A spokesperson for the council said: "Our contractors will use a targeted biological insecticide which does not pose a health risk to visitors.

"However, for your own safety, we ask that you avoid the affected areas while spraying is taking place.

"We will do our best to keep disruption to a minimum and will clearly signpost all spraying areas in advance to inform residents of any temporary restrictions."

Spraying is also being carried out at the following locations:

• Ashley Park
• Claygate Common
• Littleworth Common heathside boundary
• Littleworth Lodge
• Royvon and Norman House Ditton Common
• Thames Ditton and Esher Golf Course
• Weybridge Cricket Club
• Western Green of Hampton Court Way

The council said that due to the scale of the problem across Elmbridge, it is unable to inspect or treat the caterpillars on privately-owned land.

Anyone who experiences skin or eye irritations after coming into contact with the caterpillars should speak with their pharmacist.

If you have an allergic reaction, call NHS 111.

If pets or livestock are seriously affected, speak with a vet and tell them you suspect the animal has come into contact with the caterpillar.

Any suspected sightings should be reported to Forestry Research's Tree Alert.