Galling,

Gall of the week is that of the cynipid wasp Aulacidea follioti on prickly sow thistle. Sonchus asper.
Photos by Jean-Yves Baugnee from Plant Parasites of Europe Bladmineeders.nl

Members of the BPGS enjoying our annual gall weekend in Yorkshire last Saturday and Sunday.

Gall of the week is caused by a moth, Mompha sturnipennella on rosebay willowherb, Chamerion angustifolia.
Gall photo by Tom Higginbottom, causer photo unknown, taken from the British Plant Gall Society website: www.britishplantgallsociety.org

Just discovered a rare newspaper article on a gall - that of Diplolepis rosae, robin's pin-cushion. It’s the Guardian's Country Diary today, by Kate Blincoe. Find it at theguardian.com

Gall of the week is caused by a gall midge, Dasineura hyperici on Hypericum spp. St. John's- Wort.
Photographer not known.

Gall of the week is the little gem caused by the cynipid Neuroterus anthracinus f. agamic on oaks Quercus spp. For some strange reason known as the oyster gall.
Photographer unknown.

I think these are the galls caused by the midge Rabdophaga salicis. Happy to be corrected.

Don't forget folks iNaturalist's Gall Week is coming up - it's from the 6th to 14th of this month.

Gall of the week, maybe gall of the year it seems to be super-abundant just now, is that of the cynipid wasp Neuroterus numismalis f. agamic on oaks Quercus spp.
Photo by Peter Shirley.

Gall of (last) week which somehow disappeared into the great digital universe in the sky, is caused by the cynipid wasp Trigonaspis f. agamic on oaks Quercus spp.
Photo by Peter Shirley.

Gall of the week, one that maybe needs a bit of searching for, is a caused by avgall midge, Asphondylia ononidis, on restharrow, Ononis repans.
Photos by Sue Timms.

Gall of the week is that caused by the aphid Hayhurstia atriplicis on oraches Atriplex spp.
Photo by Roelef Jan Koops.

Gall of the week is the fungal gall of Claviceps purpurea otherwise known as ergot, on many grasses and cereals. It is the cause of St. Anthony's fire mania if consumed in contaminated flour.
Photographer unknown.

Gall of the week is a bit of a mystery. It occurs on tree-fuschia, Halleria lucida, in South Africa, I suspect it is caused by a cynipid wasp, Halleriaphagus phagolucida, but does anyone know different?
Photo by Peter Shirley

Test

Gall of the week, well two actually. A chimera with the cynipid galls of Andricus kollari/infectorius f. agamic agg and A. aries f. agamic growing in close proximity on oak Quercus spp.
Photographer unknown.

Have been catching up with verifying cynipid galls on iNaturalist. The process can be greatly speeded up if you can remember to add the generation to the name. For example Biorhiza pallida f. sexual for the oak apple gall causer, and Andricus aries f. agamic for the ramshorn gall causers.

These are knopper galls caused by the cynipid wasp Andricus quercuscalicis f. agamic.

Gall of the week is a fungal gall which at first sight might be taken for an invertebrate gall, although the there is a larger protuberance on the underside of the leaf. It is caused by Exobasidium vaccinii on cowberry, Vaccinium vitis-idaea.
Photo by Mike Poulton.

Gall of the week is caused by the midge Jaapiella veronicae on speedwells, Veronica spp.
According to Skuhrava and Skuhravy in 'The Gall Midges of Europe' this is the commonest gall midge in Europe.
Photographer unknown.

Gall causer rather than gall of the week this time. A sexual generation female of the cynipid wasp Trigonaspis megaptera which causes galls on oak trees, Quercus spp.
Photo by Michael Chinery.

They are developing silk button galls, the agamic generation of the cynipid wasp Neuroterus numismalis.

Gall of the week is caused by the psyllid Trichochermes walkeri on buckthorn, Rhamnus carthatica. Once vacated by the causer the gall is often home to aphids.
Photo by Graham Calow.

Gall of the week is I think that of the scale insect Pachypsylla celtisdismamma on hackberry, Celtis occidentalis, in North America.
Photo by Peter Shirley.

Not aware of any records of this association, my guess is that there is a rose growing amongst the cinquefoils.

That's because it is! I'm no expert on SM but have achieved nearly 2000 followers (I know, including bots) on X, and 2200 on a FB galls' page I am an admin for. Haven't discovered how to add the website link yet. But the profile does include BPGS mention. Thanks again for your advice.

Thanks, never thought of that interpretation of “galling” affecting things, but having gained 300+ followers in a week maybe not the time to change. I’ll have a look at the profile, didn’t think a picture would make a lot of difference, nobody can see it without finding the site first can they?

Thanks Dave, your advice has had an instant impact, very grateful. I am happy that we now seem to be established here. (Sorry for the delay in replying, I remembered seeing this message but had been looking for it in my emails.)

Hopefully so.

#galls Welcome and thank you to all our new followers, please spread the word.
Here is this week's gall of the week, specially for any new North American friends, it is caused by the cynipid wasp Diplolepis triforma on the rose Rosa acicularis.
Photo from Sudbury Ontario by Peter Shirley.