Burr knots (burrs or burls) are masses of small root initials, plant cells that are dividing and transforming into root tips, which appears on the above-ground portion of a rootstock, or on the trunk and limbs of apple trees. This is an inherited disorder where root-producing structures develop on aerial parts of certain apple trees.Continue reading “Burr Knots, What Are the Root-Like Growths on Apple Tree Trunks and Branches?”
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