Apple Trees

Knobby Growths on Apple Trees

Anonymous added on April 20, 2013 | Answered

Three of my six columnar apple trees have developed lumpy growths at the joints. It looks like arthritis. What is it, and what should I do about it?

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Answered on April 20, 2013

It sounds like "burr Knot", this link has images and should answer some questions:

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