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The Forestry Commission is urging the public to be vigilant and report any sightings of oak processionary moth caterpillars as their hatching season begins, with the "greatest risk
period" starting from May 28. These caterpillars pose a threat not only to trees by defoliating them but also to human health. The advice is clear: do not touch the caterpillars or
their nests. The public should refrain from handling or disposing of the nests due to the potential for painful skin rashes and irritation to the eyes and throat caused by contact with the
caterpillars' white hairs. If you come across these caterpillars, keep a safe distance and report the sighting via the TreeAlert portal. Sightings are particularly prevalent in South
East England. Dr Edward Straw, Forestry Commission Oak Processionary Moth Programme Manager, commented: "We're already receiving reports of homeowners being affected by the
caterpillars, coming out in painful rashes, and it is important those living and working in areas affected by oak processionary moth remain vigilant about the health risks they pose."
Professor Nicola Spence, UK Chief Plant Health Officer, has also sounded an alarm. He stated: "I would advise that members of the public living in London, the surrounding areas and
Derbyshire, avoid any contact with the caterpillar and its nests, as this can cause irritation. "Oak trees are an iconic and much-loved part of our British landscape. By reporting any
sightings of the oak processionary moth to the Forestry Commission, we can all minimise the pest's spread as well as reduce their impact on tree health." Renowned for their
head-to-tail parades along the trunks of oak trees, which can form intriguing patterns on the bark, the caterpillars are aptly named after this unique behaviour, reports the Mirror. These
caterpillars feast on the leaves, which impairs the growth of the oaks and heightens their vulnerability to other stressors such as droughts and diseases. Originating from Europe, the oak
processionary moth is a non-native species in the UK, identified first in London in 2006 following its accidental introduction via imported trees. As of late, this pest has been broadening
its reach throughout England, with newfound outbreaks discovered in areas that had not faced infestations until as recent as last July. The warmer weather this spring has facilitated a more
rapid multiplication of the moths, pushing forward the period of heightened danger for both the oak trees and people.