Oak processionary moth

The Oak processionary moth (Thaumetopoea processionea) is a native of mainland Europe. This organism was found breeding in the UK for the first time in 2006, on oak trees in Ealing and Richmond, in London. It was also found breeding in Pangbourne, West Berkshire, in 2010. The caterpillars feed on oak leaves and produce silken nests on the trunks of affected trees.

Photo: Forestry Commission

As well as seriously damaging trees, the caterpillars pose a risk to human and animal health. Tiny hairs from the caterpillar can lead to to itching skin lesions, irritated eyes and, less commonly, sore throats and respiratory distress. This may happen if people touch the caterpillars or nests, or if the tiny hairs are blown by the wind into contact with people.