branch collar

[John Paul Sanborn]

To be more presice, wall 4 of the CODIT model is the strongest barrier.

Wall 4 is the new growth wounding. By wounding a portion of the wound wood, you open up the wall 1, the fiber axis, to pathogenic intrusion.

The CODI model it 3 dimentional, we must allways think of it as such, especiall when we are making wounds in trucnk wood.

Tom, I've seen the term "Wound Grouping" or something similar in regurads to the coalescence of cankering and decay.

By having three or more wounds in a given area, the local tisue becomes stressed and unable to fight off pathogens by forming the physical and chemical barriers of callus and reaction wood.

BTW, there is some "discussion" amungst the white coat community as to the callus/woundwood argument.

John, The Branch Protection Zone is not just chemical, but a physical bendin f the fibers where early and late wood join on a "secondary" branch. Primary branchings, such as co-dom stems and wolf limbs, do not have colars. This is why they grow faster and have a greater rate of decay.

They also originate from the same wood as the old terminal bud, so the pith is connected, and the decay can easily go all the way to the center of the trucnk.

FWIW

 

[Guy Meilleur]

Originally posted by jkrueger
saying that there is 'rule' by which we approach all circumstances is forgeting the deeper awareness that can be achieved by studying our own work.

Thanks, Jack. Guidelines are important to steer by, but sometimes we need to make a turn. If the reasons are clear and compelling, variance from rules is justifiable. Callus tissue is not so sacred that it must remain even if it covers disease which needs to be eradicated, for instance.

Every rule has exceptions. No rule is unarguable.

 

[rumination]

JPS, What are wolf limbs?

 

[Guy Meilleur]

aka rogue limbs, wolf limbs leap out of the "pack" of branches that arise in ordinary, more orderly fashion. I don't know the biology behind their origination--a divided terminal bud?--; they seem to leap out of the tree framework.

They are better subordinated than removed because of the core connection with the stem; as usual, the smaller the wound the better.

Caracterized by lack of collar and not uncommon in eastern hardwoods; no idea if many HI trees grow what you could call wolf limbs.

I agree w jps, except on the callus/woundwood discussion. I thought that woundwood is just callus tissue that formed xylem. What other definition could there be?

 

[jkrueger]

Because I said I would!

Ok, mental record keeping problem here. Now remember that the tulip that I had mentioned was taken care of mid winter.

Not a lot of time to show what was intended.

And here is the cut at this time.

 

[jkrueger]

Here is the general condition of the tree at this time. The top tips are a little late, hmmmm, OK, anyway I did what I said.

Jack

 

[Tom Dunlap]

I knew that Shigo would have something to say about this topic. There are several pages in Modern Arboriculture. Along with the diagrams it's pretty easy to see that cutting stubs leads to more decay.

In A New Tree Biology there are more pictures and writing. Everyone, get your copy down and open to page 236. Everyone does own these books don't they? Of course, we're all professionals

"Callus collars also form around large dead branches. The great temptation on such trees is to remove the large swollen branch collars and callus collar. The swollen branch collars may grow outward to several feet on large old dying and dead branches. The question is even more important then. The answer is still the same for the health of the tree. If the large collars are unsightly, then they can be removed at the expense of causing the tree serious injury.

When trees are pruned, the dead wood should be removed first, then the dying or infected wood, and last the living wood. The process should not be reversed!"

So...there you have it. Alex gives permission to cut off those collars. But he also heaps a lot of responsibility onto your shoulders. Are you strong enough for the burden of causing more injury? I'm a weakling so I quit doing that

Tom

 

[Tom Dunlap]

If it weren't for taking one of Alex's four day courses in the mid-eighties I wouldn't be in the place I am now. He is responsible for opening up my mind and placing a good virus inside. During the class I started the final phase of my Epiphany from "Evil Tom".

Tom

 

[jamie]

collars and BBR

my knowledge is cut it at the collar but not into it. ive always been taught if you cant find the collar cut at the branch bark ridge.
if i cant find a collar i make an educated guess as to where the collar would be on that particular species.

jamie

 

[roachy]

Dan say it is'nt so John did not make those cuts,did he?
Cutting the collar is in no way a good idea but leaving a stub is a very hard sell for most.

 

[murphy4trees]

Welcome Roachy.....
I Am glad you made it over to AS..
No Jon didn't make those cuts on the cherry.... Pat did...
But I have seen Jon make similar cuts and when we talked about it he said something to the effect that he was aiming for the what would have been the oiginal target.

 

[jkrueger]

Most definitly welcome,

Meet you through John at the east comp. I think John is a clear intuitive tree person and sometime one make decisions that are out side of the book. I think most of us know that, and most of us do that.

Jack