'Do not touch' warning to Brits over caterpillar that 'can make you sick'

29 May 2024 , 15:04

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An oak processionary moth caterpillar (Image: Getty)

The public is being strongly encouraged not to touch a variety of caterpillar that can make people ill.

The Forestry Commission has released a warning for people to watch out for the oak processionary moth caterpillars. This pest doesn't only pose a threat to trees, but it is also damaging to human health. This alert comes at the start of the peak risk period for this non-native species, which is mainly found in South East England after being inadvertently introduced from Europe with imported trees for planting.

The caterpillars, known for their distinctive nose-to-tail marching formation, feast on oak leaves during their migration, impairing the tree's growth and making it more susceptible to other stressors like drought and disease, according to experts. The hairs of the oak processionary moth caterpillars, as well as their nests made of white silken webbing, can cause itchy rashes, eye and throat irritations, and are strictly advised against touching.

The public is also strongly discouraged from attempting to remove the nests, typically located on the trunks or branches of oak trees. Andrew Hoppit, oak processionary moth project manager, emphasised the importance of awareness, stating: "It is important those living and working in areas affected by oak processionary moth remain vigilant about the health risks they pose when enjoying outdoor spaces, as we are entering the greatest risk period."

First detected in London in 2006, the insect has expanded its presence to nearby counties in the South East. Professor Nicola Spence, the UK's chief plant health officer, has said: "Oak trees are an iconic and much-loved part of our British landscape."

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Adding further she explained, "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." She also advised the general public, particularly those residing in London, the surrounding regions and Derbyshire, to avoid any interaction with the caterpillar and its nests, as it may cause irritation.

People have been requested to report sightings of oak processionary moth either via the TreeAlert website or by emailing opm@forestrycommission.gov.uk.

Rom Preston-Ellis