Knobby Growths on Apple Trees

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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1 Comment To "Knobby Growths on Apple Trees"

#1 Comment By AnnsGreeneHaus On 04/20/2013 @ 9:50 am

It sounds like “burr Knot”, this link has images and should answer some questions: http://www.extension.org/pages/60605/burr-knots-on-apple-trees ^[1]

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[1] http://www.extension.org/pages/60605/burr-knots-on-apple-trees: http://www.extension.org/pages/60605/burr-knots-on-apple-trees

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