Join our 6th Gall Week event this fall! Gall Week is a global event aiming to increase our knowledge about these little-known organisms!

Gall Week events: 

• Make observations between 9/7-9/15, and add them manually to our iNaturalist project Gall Week September 2024. 
• Join our fall BioBlitz at Shady Oaks Park, and celebrate Gall Week as well as California Biodiversity Day! Saturday 9/7, from 9:00-11:30 am. More info here.
• We've got stickers! Order your September 2024 Gall Week stickers today!

How to get started? 

You can look for specific host plants, specific groups of gall inducers, or any galls you find interesting. If you've never done this before, you can check what are the best host plants in your area. You can use gall or insect books from your area, websites (such as Gallformers.org), and iNat. We highly recommend listening to an interview of gall expert Adam Kranz on the podcast Natures Archive,  a shorter episode about Gall Week 2021, and a later episode about spring galls here. You can also watch our webinar for some background. You can also look at all our previous Gall Week projects here. Another good way to start is to look at one of the gall projects and see what other people found in your area:

• Galls of California - https://www.inaturalist.org/projects/galls-of-california and many other local projects
• Galls of North America - https://www.inaturalist.org/projects/galls-of-north-america https://www.inaturalist.org/projects/north-american-galls
• Leaf and plant galls - https://www.inaturalist.org/projects/leaf-and-plant-galls
• Galls of the Eastern United States - https://www.inaturalist.org/projects/galls-of-the-eastern-united-states

You can download fliers for some of the common Bay Area galls on our main page here.