BMP - Tree Risk Assessment - 70
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*
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Buried root collar. For
Visual indicators of root/soil defects
most tree species, if the
that may indicate reduced stability
buttress roots are not vis* Dead or missing roots
ible, then there is soil
against the trunk of the
* Fungal fruiting structures
tree. Soil against the trunk
* Lack of root flare
may accelerate sapwood
* Stem-girdling roots
or heartwood decay.
* Dead or loose bark
Basal decay. Decay in the
* Wounded roots
base of the tree may indi* Root cuts
cate root decay, because
* Soil mounding or cracking
most fungi that decay the
butt or base of the tree
* Crown dieback or decline
start as root decay fungi.
* Restricted root space
Stem girdling. When
* Soil erosion
there is a root, strap,
* Excessive soil moisture
chain, rope, rock, con* Adventitious roots
crete, or other material
tightly against the lower
* Termite nests/mounds at tree base
trunk or buttress roots,
Visual indicators of compensation
growth and response
* Wide root flare
growth can be severely
* Fused buttress roots
limited. This can lead to
both health and stability
problems.
Wounded roots. The upper surface of roots tends to compartmentalize
well when damaged by lawn mowers or trimmers. However, decay
may develop in these wounds if the damage is recurring or severe,
or if the tree declines in vitality.
Oozing from the lower trunk and buttress roots may be associated
with a root disease. Root disease may impact tree health, such as from
Phytophthora infection, or may affect stability, as with an extensive
Armillaria infection.
Adventitious roots develop when the trunk is buried or there is a loss
in root function. They can serve as an indicator of and as compensation for root problems.
70
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
BMP - Tree Risk Assessment - ii
BMP - Tree Risk Assessment - Table of Contents
BMP - Tree Risk Assessment - iv
BMP - Tree Risk Assessment - 1
BMP - Tree Risk Assessment - 2
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