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?
Knobby Growths on Apple Trees
Anonymous added on April 20, 2013 | Answered
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Answered on April 20, 2013
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
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