Galling,

Gall of the week is caused by a recently discovered species new to Britain, the gall wasp Andricus coriarius f. agamic on oak, Quercus robur.
Discovered and photographed by Maria Fremlin.

Gall of the week is caused by the cynipid wasp Andricus quercuscorticis f. agamic on oaks, Quercus spp.
Photos by Graham Callow.

Gall of the week, with its causer, is that of the tephritid (picture wing) fly Urophora cardui on thistles Cirsium spp.
Brilliant photo of the insect by Malcolm Storey, gall photo unknown source.

Gall of the week, with a bonus small copper butterfly, is caused by the midge Dasineura kiefferiana on rosebay willowherb, Chamerion angustifolium.
Photo by Mike Poulton.

Gall of the week, can be found all year round, is caused by the gall midge Taxomyia taxi on yew, Taxus baccata. This is the second year gall, more often found than its smaller counterpart, the one year gall.
Photographer unknown.

Gall of the week is that of the midge Contarinia nicolayi on hogweed, Heracleum sphondylium. With a name like that perhaps we should call it Santa's gall.
Photo by Peter Shirley

Thanks for following, best wishes and good galling in 2026.

Renamed a few years ago.

Gall of the week is one you may be bringing into your home this week. It is the gall of the aphid Sacciphantes viridis on Norway spruce, Picea abies.
Photographer unknown.

Gall of the week is that of the cynipid wasp Aylax papaver on poppies, Papaver spp. An ungalled seedhead is included.
Photo by Peter Shirley

Gall of the week is caused by the cynipid wasp Cynips longiventris f. agamic on oaks, Quercus spp.
Photo by Peter Shirley

Gall of the week is caused by the gall midge Iteomyia capreae on willows, Salix spp.
Photographer Peter Shirley.

Gall of the week is that of the sawfly Blennocampa phyllocolpa on roses Rosa spp.
Photo by Tom Higginbottom on Bladmineerders.nl

Gall of the week is the nail gall of the mite Eriophyes tiliae on lime trees Tilia spp.
Photo by Mike Poulton.

Yes indeed.

Gall of the week, usually found in leaf axil buds, is caused by the cynipid Andricus glandulae f. agamic. On oaks, Quercus spp.
Photo by Peter Shirley

Gall of the week is that of the curiously two-chambered one of the cynipid wasp Cynips disticha f. agamic on oaks, Quercus spp.
Photos by Malcolm Storey.

Gall of the week is caused by the fungus Taphrina tosquinetii on alder, Alnus glutinosa.
Photographer unknown.

Still in Ohio, gall of the week is a leaf gall on white swamp oak, Quercus bicolor. Seems to be Neuroterus quercusverrucarum, the oak flake gall. Is this correct @gallformers?
Photo by Peter Shirley.

Yes it does (and not only the hybrid), in fact three species of the aphid genus Pemphigus occur on the petioles of P. nigra and its hybrids’

Gall of the week: Galling is in Ohio USA, and came across this. Seems to be a rough oak bulletgall caused by the cynipid wasp Disholcaspis quercusmamma on swamp white oak, Quercus bicolor. Happy to be corrected.
Photo by Peter Shirley.

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.