what is this disgusting thing: crown gall or burr or similar???

Hi All

Do you know what is this on my 2 years old apple ?
Noticed it few months ago
Fairly hard

Gall?  Burr knot???

I tried Copper sulphate solution and didn't work

Do I need to get rid of the tree before it infects the others???


Many thanks

I have no idea but it kind of looks like roots to me.  I'd be tempted to not worry about it at all and just see what happens.  Unless someone else comes along with some actual knowledge

Hi Unu,   Found some links for you...hope they can be of some help...good luck in identifying that,,that,,,THING!

Apple tree disease

Strange knots on apple trees

Are there cedar or juniper trees in the area?  It looks like Apple Cedar Rust.

https://www.mortonarb.org/trees-plants/tree-and-plant-advice/help-diseases/cedar-apple-rust

Thank you all for the helpful inputs

I looked on allt he links provided - also inspected the surrounding trees
No junipers or cedar in the immediate surroundings
I have in my tiny garden also a plum, a cherry and a pear - all transplanted on small roostock for them to be samll - I have a tiny garden


I attracheda pic of  the other apple tree next to it - the black thing is the fruit tree grease - and I feel the same thing with the finger like projections is turning up in two othe places already

All lesions seem to be on the initial rootstock - and not on the transplant


I decided it must be the crown gall - I will attach the internet pictured that I thought looks most similar


I must sadly say that I took the two apples out with as much root as I could - altohough I must have left plenty of little roots in
. Roots seemed ok.

Also as per RHS I threw in few potatoes in place
https://www.rhs.org.uk/advice/profile?pid=141


Please keep me posted if you have any other theories about it


Many thanks you all!!!

It is a burr knot... usually happens on the root stock.  Those are little rootlets that would root if there were some soil to root into.  Does not harm the tree as far as I know.