"Don Staples" wrote in message
...
"symplastless" wrote in message
. ..
Does anyone have any experience with the SHIGOMETER? With respect to
CER. If so, what are your thoughts on the CER mean for Mountain Laurel?
Did you notice something different about mountain laurel?

I have used SHIGOMETRY to detect woody root declines in trees.

SDTDC did not test the Shigometer, but extensive research has been
conducted concerning its uses and limitations. It is agreed that the
Shigometer is a valuable tool for determining the current vigor of trees

Don, vigor is genetic feature. What you mean to say is vitality. Or maybe
you don't. It determines a trees vitality and not vigor (CER) which means
cambium electrical resistance within a species.

and
forests (cambium testing), but since resistance changes begin prior to
damage caused by decay (xylem testing), the Shigometer technique for decay
detection requires careful application and interpretation. Basic
biological knowledge of the material being evaluated is essential. Skill
in instrument use increases with greater awareness of local biological
principles and practice with the instrument. --

You must understand the species of tree to use the wire probe. E.g., is it
a heartwood tree or a sapwood tree. What is the difference in resistance
between heartwood and discolored or color-altered wood from a wound or an
injury. Sapwood to heartwood or sapwood to discolored wood. For example,
Don, maple trees do not form heartwood. What about false heartwood? Oaks
do. I tried drilling for the wire probe and broke the small bits. $100.00
per bit. What is nice about the CER is you can detect some woody root
problems. The trunk flare will have less resistance than the measurement at
breast height. However you must understand that trees have trunk flares and
not root flares. Of course you know all of this.


What am I telling you this for? I guess I like you Don. Sorry for all the
bad things I said about you. You are really a nice guy. Don't know much
about trees and their associates relating to the ecological stages of trees,
but you are still a nice guy. I like you.


Since you have never studied biology, this pretty much leaves you out.

Show your ignorance once again. Your the one that does not get it.


By the way, do you own a Shigometer?

What kind of question is that? What do you think. Oh thats right, you
don't!

--
Sincerely,
John A. Keslick, Jr.
Consulting Forester & Tree Expert
http://home.ccil.org/~treeman
and www.treedictionary.com
Beware of so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, and volcanic eruptions keep reminding us
that we are not the boss.