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Weird growth in apple trees

Hi,
i have 3 espalier apple trees that are heavy producers. They are about 8 years old. I started noticing that they all 3 have a strange bulge at the bottom near the root ( presumably where they were grafted). Is this something to worry about or it it normal on grafted trees? The pear tree is unaffected.
The apples are lord Lambourne, bountiful and Fiesta.
i have attached pictures. 

Thank you 
Nathalie

Posts

  • AthelasAthelas Posts: 946
    edited March 2022
    I wonder if it’s crown gall — hopefully someone will be along with advice

    I’ve rotated your photos for easier viewing 




    Cambridgeshire, UK
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