Welcome to Gallformers

The place to ID and learn about galls on plants in the US and Canada.

ID a Gall →

Try and get an ID for a gall by providing known information.

Explore →

Explore Galls (including Undescribed species) and Hosts.

Resources

Our guide to gall identification.
Detailed descriptions for our key filters.
Glossary for plant and insect terms.
To ID galls and other plant symptoms in Europe, visit bladmineerders.nl

Interesting Reading

If you are new to galls Charley Eiseman and Noah Charney's Tracks & Signs of Insects & Other Invertebrates: A Guide to North American Species is a good place to start learning. It covers a lot more than just galls and is an excellent resource.
A long-anticipated update to Russo's guide to galls of the Western US was recently released by Princeton University Press.
Some advice on finding galls.