Oak Processionary Moth (OPM)

Oak processionary moth (Thaumetopoea processionea) is a species introduced to London from southern Europe in recent years.

The caterpillars have thousands of tiny hairs which can cause irritation to human and animal skin and less commonly sore throats, breathing difficulties and eye problems. Severe caterpillar infestations can defoliate trees leading to a reduction in overall tree health.

For more information and advice about the symptoms and spread of oak processionary moth in England please see the Forestry Commission website.

What should I do if I think I have seen OPM in some trees?

Check on the Forestry Commission web site for identification images and videos of the moth in all it's different life stages.

You can report it directly to the Forestry Commission via: