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