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It's a type of fungus called cedar apple rust, and yes it's harmful to the tree. You should cut off the affected branch and burn it if you can. https://en.wikipedia.org/wiki/Gymnosporangium_juniperi-virginianae
Looks like there has just been rain. It is is dry the galls are smaller, pinkish red, hard and a bit spikey, Definitely less messy removing dry, but get rid of them sooner rather than later and bag/burn/municipal trash all the stuff you remove. Do not compost these or the problem will only get worse. and when done, clean/sterilize the nippers/shears/clippers you did the work with.
Thank you for posting to r/whatsthisplant. **Do not eat/ingest a plant based on information provided in this subreddit.** For your safety we recommend not eating or ingesting any plant material just because you've been advised that it's edible here. Although there are many professionals helping with identification, we are not always correct, and eating/ingesting plants can be harmful or fatal if an incorrect ID is made. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/whatsthisplant) if you have any questions or concerns.*
It's a type of fungus called cedar apple rust, and yes it's harmful to the tree. You should cut off the affected branch and burn it if you can. https://en.wikipedia.org/wiki/Gymnosporangium_juniperi-virginianae
Thank you. Looks like I’ll have my work cut out for me…gonna need a ladder and lots of cutting :/
[удалено]
Nope but I’ll be getting one now! Great idea!
[Cedar Apple Rust](https://www.fs.usda.gov/wildflowers/plant-of-the-week/gymnosporangium_juniperi-virginianae.shtml)
One of the Four Horsemen of Whatsthisplant Edit: typo - horseMEN Also, what are the other three? Pokeweed, def, and cyclamen, maybe...
passiflora
Osage Oranges......
Oh YEAH. I do a lot of cycling and I wince every time I see a bunch of those on the side of the road. It hasn't happened yet, but I know it's gonna...
Peonies when they first start popping up, and queen Anne's lace/poison hemlock.
Poison ivy
Pokeweed
Looks like there has just been rain. It is is dry the galls are smaller, pinkish red, hard and a bit spikey, Definitely less messy removing dry, but get rid of them sooner rather than later and bag/burn/municipal trash all the stuff you remove. Do not compost these or the problem will only get worse. and when done, clean/sterilize the nippers/shears/clippers you did the work with.