BMP - Tree Risk Assessment - 64
a short distance from the branch union and mainly on horizontallygrowing branches. At this time, it is not possible to predict failure or
mitigate risk due to SBD.
Missing or Decayed Wood
Missing wood refers to anything that decreases the cross-sectional area of
a trunk or branch. This can be the result of mechanical injuries, cankers, or
decay. Mechanical injuries can also lead to cankers or decay, which can result
in further weakening.
Wood decay is the long-term process of wood degradation by microorganisms. The presence of a large proportion of decayed wood or wood
that is missing may reduce the structural strength of a tree. Decay fungi may
reduce wood strength well in advance of the development of internal voids.
However, the mere presence of decay does not indicate that the tree has been
significantly weakened.
Sometimes it is impossible to see if decay is present within a tree, but the
tree risk assessor can look for indicators to know when to investigate further.
There are two categories of decay indicators: potential indicators and definite
indicators. Potential indicators point to the possibility that decay is present,
whereas definite indicators occur only when decay is present.
The most common potential indicators of decay, strength loss, or missing wood are:
* The presence of old wounds or branch stubs that may have allowed
decay fungi to enter the tree
* Response growth patterns, such as swelling, bulges, or ridges on
the trunk or branches that form as the tree compensates for wood
strength loss
* Cracks or seams
* Oozing through the bark
* Dead or loosely attached bark, or bark with abnormal patterns or colors
* Sunken areas in the bark
* Termite trails
The most common definite indicators of decay or internal voids are:
* Cavity openings, nesting holes, and other voids or openings on the
outside of the tree
* Fungal fruiting structures, such as mushrooms, conks, or brackets
that are attached to the tree
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BMP - Tree Risk Assessment
Table of Contents for the Digital Edition of BMP - Tree Risk Assessment
Table of Contents
BMP - Tree Risk Assessment - Cover1
BMP - Tree Risk Assessment - Cover2
BMP - Tree Risk Assessment - i
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BMP - Tree Risk Assessment - Table of Contents
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