Talk:Branch collar

Untitled
Article needs public domain drawing or permission to use Shigo's.

Article needs photo.

We arborists need to add articles defining and describing our activities and terminologies.

--pechaney 15:48, 28 April 2007 (UTC)

Thanks for the ISBN and the link to the USDA site. Shigo's exploded diagram illustrates the internal anatomy.

The first photo, Branch collar.jpg, is a poor example of a branch collar. The branch has been pruned off, and wound wood has begun to form. The fact that the wound wood is not circular and is less at the pointed upper and lower parts of the wound indicate that the pruning cut was made too close to the trunk, and that the branch collar is damaged.

The second photo of the English oak is an excellent example of a branch collar.

The third photo of the bottlebrush shows trunks that could be considered co-dominant. The attachment shows included bark, and if there is any branch collar at all, it is not apparent in the photo. Co-dominant attachments do not have branch collars. Co-dominantly attached stems form wood at the same time, preventing the formation of a branch collar, while wood formation of parent and child stems that form a branch collar is non-contemporaneous.

The fifth photo, Branch Collar Pruned.jpg, has the caption, Tree that has had its branch collar correctly pruned . This is unfortunate in that the arborist does not prune a branch collar. It would be correct to say that a branch is correctly pruned to the branch collar. In this case, it is also unfortunate that the branch was pruned too closely to the parent stem, damaging the branch collar. This is apparent by the oval formation of the wound wood. Decay organisms bypass the decay resistant branch core to invade the wood of the parent stem that was exposed by pruning too close. Note that the wood of the parent stem is extensively decayed at the wound site.

The horrible photo, How to prune trees (IA CAT10819651).pdf is a perfect example of how not to prune. It shows a handsaw poised to complete the removal of the branch of a birch tree. If you know this species, you will know that it has extended branch collars. Shigo always said, touch trees, meaning that one should work with them, observe, and learn. If you touch this tree, you can see and feel where the branch collar is--but it is not where the pruning saw is in this photo.

I will also note that the word callus is used 3 times in close reference with wound wood and wound closure. Callus is undiferentiated tissue from which wound wood may form. Wound wood may expand and seal over a wound, but these wounds do not heal in the anthropomorphic sense.

pechaney (talk) 04:21, 2 January 2022 (UTC)

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