Tree Pest – Oak Processionary Moth
Caterpillars emerge between May and July to feed before turning into adult moths. They can cause damage to Oak trees as well as itchy rashes, eye and throat irritations and occasionally breathing difficulties from the caterpillar’s hairs and nests. The caterpillars are currently found in London and the South East and the Forestry Commission is urging members of the public to report any sightings.
https://www.forestresearch.gov.uk/tools-and-resources/fthr/tree-alert/