What's in my Willow leaves?

jessbee · July 2021

I have a Kilmarnock Willow and when I was watering it, I noticed these in the leaves.

Does anyone know what they are?

Thanks,
Jess

Alan Clark2 in Liverpool · July 2021

Galls, caused by a sawfly. They are harmless and will not damage the tree.

http://www.ukwildlife.net/galls/tenthrenid_gall.html

jessbee · July 2021

Thank you! Appreciate your help.

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