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)

External links modified

Hello fellow Wikipedians,

I have just modified 2 external links on Branch collar. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20090529195427/http://www.na.fs.fed.us:80/Spfo/pubs/howtos/ht_prune/prun014.htm to http://www.na.fs.fed.us/spfo/pubs/howtos/ht_prune/prun014.htm
• Added archive https://web.archive.org/web/20070426071433/http://www.na.fs.fed.us:80/spfo/pubs/howtos/ht_prune/cuts.htm to http://www.na.fs.fed.us/spfo/pubs/howtos/ht_prune/cuts.htm

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}).

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 08:54, 7 November 2016 (UTC)