Burr Knots, What Are the Root-Like Growths on Apple Trees Trunks and Branches?

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 Trees Trunks and Branches?”