Oak Processionary Moth Alert Ahead Of Peak Season

UK Gov

Public and forestry trade vigilance needed as we enter the greatest risk period for oak processionary moth (OPM).

The public are being urged to be vigilant for any sightings of oak processionary moth caterpillars, a tree pest of oak trees.

The caterpillars - predominantly found in South East England - descend down oak trees in head-to-tail procession, earning them their name. They feed on the leaves as they move which can negatively impact the oaks growth. This can weaken the tree and leave it more vulnerable to other stresses, such as diseases.

The warning has been issued today by the Forestry Commission who are urging the public to report any sightings via the TreeAlert portal or by email to

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