SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY
Callus closing the wound in the trunk of a pine tree caused by the removal of a dead branch. A tree branch has a branch bark ridge, often referred to as a branch collar, that separates the branch from the tree trunk. The collar is the swelling located at the base of a branch where the branch meets the trunk. The callus that forms the collar is an area of tissue that contains a chemically protective zone. The natural decay of a dead branch stops when it reaches the collar. When pruning a dead branch, a new wound should not be created by cutting into the ring that forms around the dead branch. Externally, callus tissue develops around the injury and should eventually cover it by growing over the dead wood.
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