Any idea what these things on the leaves are?
Check back with you later!
Guess we should have clarified that these things are not ‘on’ the leaves but are growing out of them. That’s what happens when something gets into the leaf tissue and the leaf doesn’t like it. This might be an insect laying an egg or a fungus spore getting into a wound. The tree cells rally and create a ‘gall’ around the invader. Different plants create different galls, the most famous and noticeable being the Oak Apple Gall. (Squirrel kits have to learn that those are not food, since they grow where we expect acorns!)
We had to write back to our reader to learn what kind of a tree this was…by the way, thank you to Jeanine for allowing us to use her photos for today’s mystery!
The tree looks like a type of wild cherry, but we’re not sure which.
So with that information, we were able to narrow our search and came up with spindle galls. Viette’s Views gardening blog has an excellent photo essay on galls which includes notes on spindle galls, caused by microscopic mites called eriophyid mites.
Ok, that sound like a bug you can’t stop, and the tree is dealing with it the best it can!