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#gallweek2024

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SK53

@fowp Of course you can. The records are all on iNaturalist (with a view older ones: inaturalist.org/observations?n), and I think all the photos are licenced CC-BY-SA on there, including Timaspis. I've even got one or two gall records from the Arbour Oak.

About 9 years ago I had a productive session looking for galls in the Hall Gardens with the late Peter Cooke of Coventry & District Natural History Society. Felt gall on Holm Oaks should be obvious.

Globular Kidney Galls of the gall wasp Trigonapsis megaptera on an epicormuc twig on the ble of an oak tree along Digby Avenue, wollaton Park. There are three galls varying from brown to a light yellowy-green, and of slightly different sizes (6-10 mm). They differ from other spherical galls in not being hard and woody.
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Colin Purrington

Photographed over a dozen galls yesterday to kick off Gall Week. Here's one made by the cynipid wasp, Andricus nigricens. Each little lobe has a single wasp larva, and sometime in the fall they drop off onto the ground. #gall #galls #GallWeek #GallWeek2024 #biology #plants #nature #quercus #oak inaturalist.org/observations/2

iNaturalistAndricus nigricensAndricus nigricens from Swarthmore, PA 19081, USA on September 7, 2024 at 12:17 PM by Colin Purrington
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SK53

Found an absolutely tiny gall of Andricus gemmeus this morning (that's a 5p coin for scale). They seem to be a couple of weeks later this year as lots more visible than a few days ago.

A couple of very small galls of Andricus gemmeus on oak buds. The galls are hemispheres covered with conical growths and yellow and green in colour. Scale is provided by a 5p coin on the left.
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SK53

This week, starting yesterday, is Gall Week on inaturalist.org/projects/gall-.

Observations are welcomed from anywhere in the world, although timing favours peak gall season in temperate Northern hemisphere. To add them requires joining the project and then adding them explicitly (a 'traditional' project). Worth having a go if you use iNaturalist and see galls casually.

Here are some of mine from yesterday.

Galled leaflets of the leguminous tree False Acacia Robinia pseudoacacia. The galls show as rolled edges of the leaflet and contain a tiny maggot of the gall causer, Obolodiplosis robiniae, a midge.
Gall of Andricus gemmeus. A small (3-4 mm) hemisphere of slightly hairy knobbly projections covering a bud of an oak sapling. The gall is reddish, was initially yellow, and will later turn brown, at which point they are quite cryptic. First found in Britain in 2008, but more or less everywhere now.
Hairy galls of the midge Hartigiola annulipes growing close to the central vein of a European Beech leaf. The galls are cylindrical projections growing vertically from the green leaf surface, brown and covered with hairs. About 3-5 mm high.
Galls of the psyllid Trioza centranthi on Red Valerian. Galls are rolled and thickened leaves, which, as here, are often reddened. The flattened nymphs live in the galls. A coastal species, presumably susceptible to frosts, until it rapidly moved inland from around 2016 onwards.
#PlantGalls#GallWeek2024
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Ashes and Dust

It's GALL WEEK!!!

Here's a gall on a wild strawberry caused by a (likely undescribed) gall wasp species in the genus Diastrophus. The gall even started growing roots! Found in the boreal forest of northwestern Ontario, Canada.

Post your gall pics and join the project on iNaturalist. Get your gall on!!

#Cynipidae #gall #galls #GallWasp #iNaturalist #GallWeek2024 #Diastrophus #Ontario #Canada

inaturalist.ca/projects/gall-w

A strawberry plant that looks as if someone stuffed a potato into the stem.
Photo of the underside of the swollen strawberry stem with rootlets growing from the gall.
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Daniel 🐅🏔

Here’s my first contribution!

This is a “t-distichum-starburst-gall” on our Baldcypress. It is actually an undescribed species! This is the second location I’ve found it in, and the first time at our place. (Edit: I'm not the only observer in Louisiana; I just figured out how to search iNaturalist by observation fields)

Several small yellow spiky “flowers” (that are actually galls) grow from the small, spiky conifer needles of a cypress tree
#NativePlants#galls#gallformers
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Daniel 🐅🏔

It's Fall Gall Week!

Get out there and look for weird bumps or growths on plants, take some pics, and upload to iNaturalist. Oak trees are always good hosts, and asters seem to be having a big gall year, at least where I live.

There is an iNaturalist project you can join here: inaturalist.org/projects/gall-

You can tag me (@daniel_observer) to help with IDs, or use gallformers.org to find out more info!

An illustrated picture of a herbaceous plant with many different strange growths on it of all shapes and sizes, representing different plant galls that might grow on it. Text reads "Gall Week September 2024."
#NativePlants#galls#gallformers
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