What is this growth on the leaves of my alder tree?
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I’ve been seeing this for a while now, anybody have any idea what it is? is it dangerous? is it a disease? These lumps on the leaves seem to be clustered on nearby leaves in different parts of the tree.
Did you try cutting one open? Maybe it’s one of those bugs that lays eggs inside and then it makes that ball of stuff, I forgot how it’s called.
Yeah, just tried slicing some of them open. There’s some kind of a worm in each one! I think it may be some kind of gall wasp. That’s what appeared when I started searching things out. Seems it isn’t dangerous for the tree and even though it’s a wasp, they don’t seem dangerous for us at all.
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