Plum leaf problem

Asked May 21, 2020, 11:53 PM EDT

My nephew in Circle Pines, MN, has this on his plum tree leaves. Is it a fungus? Can you identify it, and if so, recommend a treatment.

Anoka County Minnesota

1 Response

They are nipple galls. They don't hurt tree and treatment is challenging. I have never seen as severe an example.
https://extension.umn.edu/yard-and-garden-insects/insect-and-mite-galls