Pollarding generally assumes starting when the tree is young, which helps in preventing decay, and then annual maintenance. That is a difference, I believe. Selecting which species respond well to pollarding, is another difference. Topping requires considerably less specificity.
I was under the impression that most "successful" pollarding, is initiated when the tree is at a young age.
As regarding disease, a small quotation:
"The pollarding process does not severely circumvent the natural protective mechanism that protects the tree from disease and insects. Topping...
What one article has to say about it:
Topping:
Common, but inappropriate;
Stem diameter and age not considered;
Practiced on any trees of any age;
Return pruning may not happen;
Causes decay in cut branches;
Creates weak attachments that may become dangerous;
Can decrease the tree...
I've seen some interesting pollarding done on trees planted close to a tall fence, where the trees were meant to be kept below the fence height. The effect was like a living irregular lattice work against the simply designed solid flat fence. It created a pleasant atmosphere, and was rather...
Good point Jerry, on Dave's good point :|:
Having a sensitive eye for things is really important. Part is training and experience, part is inherent talent. Te best way of looking at things is not only with your eyes, a teacher told me many years ago. "You must learn how to look at things...
Treevet, I think that you miss the point.
Order of expertise in the Treehouse:
Beginner, intermediate, expert, hack. Another cool thing about the place!
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