Craneiobia corni

Cornus gall midge

Description

On leaves of Cornus are found massive galls. On the top side they look like relatively regular, smooth, conical outgrowths, about 5-6 mm tall, on the bottom side of the leaf they are like irregular ‘roots’ of the same shape, about 8-15 mm long. The colour of the gall is from green to reddish-brown. Massive occurrence of the species is relatively common and often almost all leaves of the tree are attacked. Larvae hibernate in the soil and pupate in the spring.

Symptom

On leaves are found massive galls. On the upperside of the leaf they look like relatively regular, smooth, conical outgrowths, about 5-6 mm tall, on the underside of the leaf they are like irregular ‘roots’ of the same shape, about 8-15 mm long.

Tree Species: Dogwoods

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes