People are being urged to remain vigilant as oak processionary moth (OPM) hatching season begins.

Commonly found in South East England, the OPM is known for its disastrous effects on oak trees and hazardous impact on humans and animals.

Distinguishable by their black heads and grey, furry bodies, the caterpillars of the moth are typically found through spring and summer until the end of July, colonising on the trunks or thick branches of oak trees.

Feeding on the leaves of several oak species, the caterpillars strip the trees of foliage, compromising their growth rate and leaving them vulnerable to future disease.

Dr Edward Straw, OPM programme manager at the Forestry Commission has issued a warning ahead of the OPM hatching season, stating:

“The warm weather in spring has led to oak processionary moth growing quicker than in previous years. We’re already receiving reports of homeowners being affected by the caterpillars.”

Adding that it is important for those living and working in areas affected by OPM to “remain vigilant about the health risks they pose.”

Coming into contact with the caterpillar’s hairs can cause itchy rashes, sore eyes and throats, and can potentially lead to difficult breathing.

Back in 2023 the species was found to have spread to Derbyshire, over 150 miles outside of the known London established area.

OPM sightings can be reported via the TreeAlert portal or via email to opm@forestrycommission.gov.uk.