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Dryomyia circinans

Gall wasp Dryomyia circinans

Description

The species creates hairy, galls (5–7 mm in diameter) on the underside of the Quercus cerris leaves. On the top side of the leaf a small pointed bump is visible, occasionally with an opening in the middle. The small fly tends to be very common and over 50 galls can occur on a single leaf. In cases of outbreak, the leaves are weighed down with the galls and twigs may break under their weight. The tiny larva develops and also pupates inside the gall. Adults hatch in spring. The species has one generation per year. It is more common in sunny and warm locations.

Symptom

Hairy galls (5–7 mm in diameter) on the underside of the Quercus cerris leaves.

Tree Species: Oak

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Seasonal frequency of occurrence

Seasonal frequency of occurrence