Devonian's picture

What Gall?

Observed: 17th May 2011 By: DevonianDevonian’s reputation in InvertebratesDevonian’s reputation in InvertebratesDevonian’s reputation in InvertebratesDevonian’s reputation in Invertebrates
Gall (1)
Gall (1) 1

Red blisters on the leaves of evergreen oaks (including cork oak [Quercus suber]).

  • a gall wasp (Plagiotrochus australis)
    Confidence: It's likely to be this, but I can't be certain.
    Likely ID
    a gall wasp (Plagiotrichus quercusilicis)
    Confidence: I'm as sure as I can be.
Species interactions

No interactions present.


DavidNotton's picture


Now known from Wales and London, most probably imported in situ with ornamental trees grown in Mediterranean nursaries. If you can spare it, I'd be grateful for a small sample for the national collection, especially if you are able to rear out the gall wasps, which would help confirm the record. Many thanks!

David Notton
Senior Curator (Hymenoptera), Department of Entomology: DC2-3N, The Natural History Museum, Cromwell Road, London, SW7 5BD

Devonian's picture

Plagiotrochus australis

Thanks for your response to my oak gall posting.

If I can get back to Mount Edgcumbe, and I shall definitely look for an opportunity, then I shall certainly send some specimens to you. If there should be any delay maybe another iSpot will be willing to help out.

DavidNotton's picture

Plagiotrochus spp.

This means there are at least three Plagiotrochus in the UK now, Plagiotrochus quercusilicis, australis and coriaceus. It's worth looking at Quercus ilex, Q. suber and other Mediterranean oak species which are planted in the UK as many of these are imported as good sized sapling trees from Mediterranean nurseries, and more new gall wasps can be expected.