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Macrodiplosis volvens

Gall midge Macrodiplosis volvens

Description

The gall is formed by a rolled leaf margin segment, situated between two lobes. Inside the fold lives the larva. Fully grown larvae leave galls, fall to the ground and enter the soil where they remain till the spring of the following year. One generation develops per year. It is common on all oak species, less common on Quercus cerris.

Symptom

The gall is formed by a rolled leaf margin segment, situated between two lobes. Inside the fold lives the larva. 

Tree Species: Oak

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes