Massalongia rubra

Alternative names
Massalongia ruber

The gall midge Massalongia rubra galls the leaves of Birch (Betula). The gall takes the form of an elongated woody swelling along the midrib of a normally expanded leaf. The gall may be up to 10 mm in length. It may also affect the petiole or extend into the bases of lateral veins. It is most prominent on the underside of leaves and starts of green in colour becoming red-purple and then brown.

Identification difficulty

Where Birch (Betula) is present.

When to see it

Galls can be seen when Birch (Betula) is in leaf.

Life History

The midge larvae are white or yellowish when young red when mature.

UK Status

Not well recorded but seems to be quite widespread in England and Wales.

VC55 Status

Status in Leicestershire and Rutland not known.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map