Oak Processionary Moth

Life Cycle - Egg Plaque


Eggs are laid from July to early September.

Each female lays between 100 and 300 eggs on twigs and small branches in the canopy.

The eggs are deposited in rows in a single layer to make up a plaque.

The plaques are covered with greyish scales and remain on the branches over the winter.

Eggs can survive extended freezing.

Eggs might not all hatch in same year.

They’re very hard to spot so not practical as survey tool.

Located on new growth in upper half of canopy.

Open sunny habitat favoured.

Oak Processionary Moth - Eggs