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Oak slug sawfly

Oak slug sawfly; this 7 mm wasp is found in the temperate regions of the Northern Hemisphere.

recognize larvae oak slug sawfly
Larvae oak slug sawfly, photo: Beentree - CC BY-SA 3.0

Oak slug sawfly (Caliroa annulipes). This 7 mm wasp belongs to the temperate regions of the Northern Hemisphere. The larvae grow 1 cm long and look somewhat like slugs.
The wasps are active from May through September. The 1.5-cm-long caterpillars look alikes eat away the mesophyll on the underside of the leaf. The leaves turn brown and fall off.
The sawfly overwinters in the soil.
A true pest can lead to growth reduction due to leaf drop. Young plantings, lime trees and trees in containers are vulnerable.
Parasitic wasps are among the natural enemies of leaf wasps: parasitic wasps lay eggs in the larvae.

Where to find

Control

Damage from the oak slug sawfly is generally limited; damage occurs mainly in arboriculture and in parks and streets with many trees.

Prevention

Does not apply.

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