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Rick M @rickmartin.bsky.social · 10/05/2026

An oak cherry gall, caused by a tiny parasitic wasp co-opting the leaf bud, causing it to produce a life support growth pod for its larvae instead of a normal leaf 🌱🌳 #PlantSky #WildflowerHour #Trees #TreeClub #ThickTrunkTuesday #Nature #UKWildlife

A small spherical berry like structure, green mottled with veins of red freckles, growing among a cluster of young oak leaves (probably quercus robur). This one is on an oak seedling I've been growing with the probavly vain hope of eventually turning it into some kind of bonsai. The gall process does the tree no harm apparently to be left to get on with it.

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Rob Stephens @tillingtonchum.bsky.social · 05/05/2026

Down the valley, a Lime Nail Gall caused by the gall mite Eriophyes tiliae.

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Casey Girard @riverthrushstudio.bsky.social · 27/04/2026

an oak and a gall wasp made this. Wool Sower Gall Wasp. @inaturalist.bsky.social #CityNatureChallenge

A fluffy growth on a young white oak branch. The growth is a fluffy ball that is yellowish with pink spots of tuft.

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Sally James @jamesian.bsky.social · 27/04/2026

Thanks to the #CityNatureChallenge I now have seen a Thimbleberry Gall Wasp nest, in a thimble berry plant at Carkeek in #seattle. #entomology #wasp

A small brown insect nest, for the Thimbleberry wasp, is shown on a branch inside a green background of leaves.

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cluesan al-gaib @clueless.bsky.social · 06/05/2026

good gall y’all

a photo of a Woolly Catkin Gall Wasp gall which looks like slightly runny blood on a dirty cotton ball, galled up on a new green oak tree branch

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Scott P. Egan @scottpegan.bsky.social · 07/05/2026

Our research was recently featured on the German TV game show "Wer weiß denn sowas?" ("Who knows?")! The question covered our #discovery of parasitism by the love vine, Cassytha fuliformis, on the gall wasp, Belonocnema fossoria, published in @currentbiology.bsky.social by @cellpress.bsky.social.

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Scott P. Egan @scottpegan.bsky.social · 11/05/2026

CT scan visualizes the adult gall wasp Callirhyitis quercusbatatoides inside the stem gall it induced on the southern live oak, Quercus virginiana. 🤯 (Image by Egan lab undergrad Lily Hestjean in the lab of @Sternarchella.) #biodiversity

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Clydeside Wild (Dean) @clydesidewild.bsky.social · 30/04/2026

A couple of #galls from along the Sheffield & South Yorkshire Navigation Canal

Leaf roll galls on Red Valerian : caused by the Psyllid 'Trioza centranthi' 24/04

Mossy Willow Catkin Gall : causer unknown but thought to be a virus/bacteria that causes the distortion of the catkins. 25/04

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Galling, @galling.bsky.social · 23/04/2026

Gall of the week, a bit of a challenge to find, is caused by the sawfly Euura mucronata on sallows, Salix spp. It may be a complex of species according to the host species, so maybe should be E. mucronata agg. Photographer not known, image from the excellent BPGS website.

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Ramsey Sullivan @ramzsullivan.bsky.social · 06/04/2026

Back after a hiatus and getting things going again with my favorite pictures showcasing some of the amazing diversity of #Cynipid #galls. #entomology #insects #bugs #wasps #nature #botany #oaks #ecology

Four different types of cynipid galls grow on a gamble oak leaf.

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Dantastic @dantastic.bsky.social · 08/04/2026

OTD in 2017 - wasp gall on a leaf

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Galling, @galling.bsky.social · 09/04/2026

Gall of the week, a cynipid wasp gall on roses in Canada. Details in the caption. Photo by Peter Shirley.

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Clydeside Wild (Dean) @clydesidewild.bsky.social · 08/04/2026

Tuesday 7th April Cigar Galls, on Common Reed 'Phragmites australis' : caused by the Frit Fly 'Lipara lucens' (The Saltings, Old Kilpatrick, Dunbartonshire) I'll try and get a pic of this years new galls when they're fresh. #galls

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Philip Amies @philipamies.eurosky.social · 05/04/2026

Many online sources suggest Crown Gall caused by Agrobacterium tumefaciens which causes galls in many dicotyledonous plants, illustrated on a rose.

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Philip Amies @philipamies.eurosky.social · 05/04/2026

A gall on Forsythia, the linked paper states that in Guide to Plant Pathogenic Bacteria, J. F. Bradbury, 1986, CABI, Pseudomonas savastanoi cases galls in Forsythia spp. www.frontiersin.org/journals/pla...

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Clydeside Wild (Dean) @clydesidewild.bsky.social · 16/03/2026

Sunday 15th March My 2nd species rearing result of the year 😃 Makes a change from Light Brown Apple Moth 😉 #teammoth

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Clydeside Wild (Dean) @clydesidewild.bsky.social · 05/03/2026

Wednesday 4th March What i believe to be the tenanted leafmine of the Leaf Beetle 'Sphaeroderma testaceum' on Knapweed. Collected from Craighall Rd, Craighall.

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Dan Houghton @dan-h-n.bsky.social · 04/03/2026

Orange Ladybirds hibernating in the shelter of an 'artichoke gall' induced by the gall midge Taxomyia taxi on Yew in the local cemetery this afternoon. #galls #Ladybird

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GFRE @guildford.bsky.social · 23/02/2026

Wattle (acacia) gall rust #Tree #Fungus #Acacia #Nature #Australia #Gunaikurnai country is different #Photography #Oppo

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GFRE @guildford.bsky.social · 23/02/2026

Massive gall on a Sheoak (Allocasuarina) #Tree #Shrub #Bush #Australia #Gunaikurnai country is different #Photography #Oppo

The image shows a gall on a plant stem, Allocasuarina, commonly known as sheoaks

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Heidi Eaton @heidi-eaton.bsky.social · 08/02/2026

The February photo from @bugeric.bsky.social and my calendar we make for family is this close-up of a gall caused by a tiny wasp in the genus Acraspis on a Chinkapin Oak leaf. #insects #galls #macrophotography

A tiny gall is attached to the vein of an oak leaf. The gall is pale green and spiky and the tips of the spikes are a reddish-purple color. This gall is caused by a tiny wasp in the genus Acraspis.

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Galling, @galling.bsky.social · 19/02/2026

Gall of the week is caused by the cynipid wasp Pediaspis aceris on sycamores, Acer spp. A recent arrival in the UK. Photo by Stephane Claerebout from bladmineerders.nl

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norikonbuchan.bsky.social @norikonbuchan.bsky.social · 22/02/2026

During our Valentine’s Day weekend trip, I spotted an acorn on blue oak with a gall wasp (presumably Andricus albobalani) chewing her way out. So I kept the acorn and she emerged from it in our hotel room. Most people probably don’t consider this as a romantic gift but I think it is 😂

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beansgirl™ @beansgirl.neocities.org · 01/03/2026

Some cedar-apple rust I found in 2024 :)

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Brad Frederiksen @bradfrederiksen.bsky.social · 17/01/2026

Could a tree gall get any cuter? #trees #photography

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Miles Zhang | 张远濛 @ymilesz.bsky.social · 26/01/2026

The preprint of the first of the batch of parasitoid wasp genomes that we are generating is now out. Erythrina gall wasp is an invasive pest on the Hawaiian wiliwili tree, we were able to generate a HiFi genome using 1/10 of a flowcell, costing only ~$100 for the sequencing.

Image of Quadrastichus erythrinae and its galls

Summary figures of the Q. erythrinae genome

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Lee @my-liquid-head.bsky.social · 27/01/2026

Galls on a silver birch tree, as #light breaks through on a cloudy afternoon. #treeclub #ThickTrunkTuesday #trees #ClassicMono

Gall growths on a leafless birch tree in sunshine. More trees and moorland are in the background. The sky is heavy with grey clouds.

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Spoontaneous @spoontaneous.bsky.social · 04/02/2026

A repost... 'Bottlebrush Gall' ~ A gall is somewhat like a burl... an abnormal growth on a tree usually caused by insects or disease. This one was on a branch brought down by one of the hurricanes visiting South Florida.

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martinadams1.bsky.social @martinadams1.bsky.social · 08/02/2026

Dryomyia lichtensteinii, a gall caused by a fly, on a Holm Oak on Brownsea - 1st UK record in 2021, 1st Dorset record in 2023. Interestingly, all over one tree, completely absent from the next tree that is virtually touching it! #wildbrownsea @dorsetwildlife.bsky.social @galling.bsky.social

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Simon Heyes @simondheyes.bsky.social · 13/02/2026

I am simultaneously excited that there is so much to learn about the natural world and also frustrated that I don't have all the answers now. Two galls I'm seeing and here and there is nothing about them in the literature. Eremophila leaf galls and these spongy Banksia galls demand answers

Juicy purple green leaf galls in Eremophila deserti near Melbourne, Australia

These weird brown spongy galls appear to affect the follicles of Banksia marginata in western Victoria, Australia.

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Simon Heyes @simondheyes.bsky.social · 13/02/2026

Here's some impressive Mesostoa kerri galls on silver Banksia. Because we can roughly date Banksia with node counts we can tell that this Banksia has been infested for several years and because Banksia retain cones for years we also know this individual has not successfully produced any fruit.

Large swollen stem galls. These are usually packed will larvae of this host specific wasp

Here are several years of galls. They form on the newest growth and Banksia can be dated with node counts so we get a good idea of how long they've had this colony of gall wasps

These are previous years galls that are filled with exit holes

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Galling, @galling.bsky.social · 12/02/2026

Gall of the week is that caused by the gall midge Rabdophaga salicis on willows, Salix spp. Photo by Peter Shirley.

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Richard Winspear @boggy-on-trent.bsky.social · 09/02/2026

Today's new species was the leaf-mine of Chromatomyia scolopendri in Hart's-tongue Fern at Ticknall Limeyards

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Colin Purrington @colinpurrington.bsky.social · 06/02/2026

New on my blog: last fall I took photographs of all the different wasp species that were loitering around the eastern redbud trees in my front yard. People driving by gave me strange looks, but it was worth it. 🌿🧪 #wasps #beetles #insects #entomology #photography colinpurrington.com/2026/02/gall...

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Gallery of parasitic wasps from the redbuds in my front yard » Colin Purrington's blog

Now that my eastern redbuds (Cercis canadensis) are pumping out thousands of pods each fall, I thought I’d start photographing the wasps that show up to parasitize the redbud bruchids (Gibbobruchus mi...

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William Bishop @wjrpb.bsky.social · 07/02/2026

Andricus sieboldi. The Barnacle Gall. Wasp gall on oak sapling. Bayfordbury, Herts today. Always near the base of the plant. #galls #galling.

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Galling, @galling.bsky.social · 05/02/2026

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.

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Jeremy Sell @jeremysell.bsky.social · 30/12/2025

A blue columbine (Ranunculaceae: Aquilegia coerulea) infested with the larvae of columbine leafminer flies (Diptera: Agromyzidae: Phytomyza miniscula). Blissfield Michigan, 14 Jul 2025.

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Jim Hayden @jeh8i8.bsky.social · 26/12/2025

This greenbriar leafminer, Marmara smilacisella, adorned its cocoon with clusters of pearlescent bubbles. I wish my holiday decorations were so neat!

Cocoon of a leaf-mining moth ornamented with bubbles excreted by the caterpillar

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Spooky Swamp @swampvids.bsky.social · 13/12/2025

Amazeing artwork by an aspen serpentine leafminer, Phyllocnistis populiella. #moths #bugsky #naturesky

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Scott P. Egan @scottpegan.bsky.social · 29/12/2025

Why are other insects commonly found on oak galls? The gall wasp not only manipulates the physical growth, but some can manipulate the vascular system to emit a sugary liquid, attracting other insects to feed, and defend, the baby wasp inside. #biodiversity #mutualism

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norikonbuchan.bsky.social @norikonbuchan.bsky.social · 26/12/2025

These little miracles (Antron douglasii aka Spined Turban #Gall #Wasp) emerged from pink stars on Christmas Eve. Happy gallidays!

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Moths in a human suit (they/them) @lycomorpha.bsky.social · 23/12/2025

19. Poplar spiral gall in a black poplar leaf stalk. These are twisty little galls caused by an aphid that induces formation of a short corkscrew of distended leaf stem. I'm more familiar with wasp galls on oak. So I I thought this aphid gall was very curious. #SciArt #ArtAdventCalendar

A colour pencil and watercolour drawing of a twisted, lumpy poplar spiral gall in the stem of a poplar leaf. The galls are the result of an aphid, Pemphigus spyrothecae, developing in the leaf stalk of black poplar, Populus nigra. The aphids cause a spiral structure with 2-3 turns to form in a petiole (leaf stalk.) Galls start off green, turning to yellow and red as they mature in August to September.

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Anthony Speca | Aspen Ecology @aspenecology.com · 16/12/2025

This is oak marble #gall. Sort of 'tumor' of oak buds caused by #wasp Andricus kollari, whose larvae develop within. Hugely important both economically and culturally: source of iron gall ink, standard handwriting ink in Europe from Roman times until century ago! Near Lincoln, Lincolnshire, England.

Oak marble gall : Andricus kollari : England : VC54 North Lincolnshire : TF3186 : October 2025 : On Quercus bud

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Insetos do Brasil @insetosdobr.bsky.social · 04/01/2026

🇧🇷 Two-horned Gall Wasp 🌍 Dryocosmus dubiosus 📝 🔗 Observação: www.inaturalist.org/observations/33…

Foto de Two-horned Gall Wasp (Dryocosmus dubiosus)

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Carla S. Pimentel @carlaspimentel.bsky.social · 08/01/2026

Galls of the acacia gall wasp (Trichilogaster acaciaelongifoliae) on spike wattle (Acacia longifolia). Caparica, Portugal. #galls

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Insetos do Brasil @insetosdobr.bsky.social · 18/01/2026

🇧🇷 Beaked Twig Gall Wasp 🌍 Burnettweldia plumbella 📝 On leather oak. 🔗 Observação: www.inaturalist.org/observations/33…

Foto de Beaked Twig Gall Wasp (Burnettweldia plumbella)

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