(440) 286-9516
Is this a gall or a nut? It was spotted on the tree that borders the entrance walk to the West Woods Nature Center. Thank you. Photos taken: May 25, 2025
Is this a gall or a nut? It was spotted on the tree that borders the entrance walk to the West Woods Nature Center. Thank you. Photos taken: May 25, 2025
What you found is a willow pinecone gall. It is created by the Willow Pinecone Gall Midge, a small fly that lays a single egg on a leaf bud at the end of a branch in the spring. The leaves then curl around it to protect the developing egg.
When the egg hatches, it forms a maggot that will overwinter, pupate and emerge as an adult in spring.
Click here for a link to a fascinating article from The Ohio State University.
The midge does not harm the willow. It is also an important food source for birds and other animals.
Thanks for your question!
-Naturalist Denise Wolfe
Do you enjoy special events, family activities, experiences in Nature, programs for seniors or or several/all of the above? Sign up for our emails tailored to your interests by selecting the proper categories below. We promise we won’t flood your inbox – just send you what we think you’ll like.
We look forward to keeping in touch!