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Crab Apple Trees

Q.My Flowering Crab Apple Has Rusty/red/pink Bumps On The Bark Of The Limbs…what Is It?

Zone Monte Lake BC Canada zone 3-4 | Anonymous added on March 14, 2021 | Answered

it’s an old flowering crab apple I let 4 trunks grow tall I prune any other suckers that come up. this rusty/red/pink colored bumps started last spring & I thought I had pruned them out, but it seems to also be on the trunk. I have decided to cut down the tall shrub, it has gotten too lanky, but I don’t know what it is, if it spreads or if the wood needs to be burnt. thank u

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Certified GKH Gardening Expert
Answered on March 15, 2021

As you can see from this article, there isn't anything that exactly matches your description. https://extension.psu.edu/crabapple-diseases Cedar Apple Rust may be the culprit. Here's an article about that: https://www.gardeningknowhow.com/edible/fruits/apples/cedar-apple-rust-control.htm
I would definitely recommend removing and destroying any remaining wood from the tree. You may want to take a close look at any surrounding cedars.

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