Davey Tree Report


 

 

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The city began its inventory of all street and park trees in February 2009 as the initial step in developing Ann Arbor's first urban forest management plan. The city contracted with the Davey Resource Group, a Division of the Davey Tree Expert Company. The inventory was perfomed during February, March, and April of 2009. resulting in the Davey Tree Report.

The Davey Tree Report is an important informational tool, and will help AATC to take an effective and informed role in establishing a tree care ordinance for Ann Arbor. If you plan to use this data to research a particular tree, it will be helpful for you to have a basic grasp of overall numbers, classifications, and definitions. Below are some of the general numbers, percentages, and definitions cited in the Davey Tree Report. For example, you can see that nearly 60% of our trees are medium in size, but less than 8% are large in size; over 50% of all trees are in fair condition; and over 2400 trees are recommended for removal.

 

 

 

Snapshot of Davey Tree Report data

 

40,749         Street Trees
   6,610        Park Trees (in mowed areas)
   8,853        Potential Planting Sites
      843        Stumps

57,055        Total

 

38.22 %  =  Maple trees

18.00       =  Pear,Elm,Sycamore,Pine,Spruce

19.00       =  Other

  7.75       =  Honey Locust

  6.63       =  Oak

  6.44       =  Apple/Crabapple

  5.15       =  Linden

 

32.9 %    =  Small trees (less than 6 inch diameter)

59.6         =  Medium trees (7 to 24 inch diameter)

7.80         =  Large trees(24 inch diameter and greater)

                    (Note: Diameter is measured at chest height)

 

  1.1 %   =  Very Good condition

32.6        =  Good condition

54.0        =  Fair condition

10.3        =  Poor condition

  0.7        =  Critical condition

1.13        =  Dead

 

 

743 trees     =  Priority 1 removal recommendation

825 trees     =  Priority 2  removal recommendation

844 trees     =  Priority 3 removal recommendation

843 stumps =  Stumps in need of grinding/removal

 

1,151 trees  =   Priority 1 pruning recommendation

2,563 trees  =   Priority 2 pruning recommendation

27,725  trees   = Large Tree Routine Prune category

   3,733 trees   = Small Tree Routine Prune category

   9,775 trees  =  Training Prune category

 


 

Maintenance Classifications/Definitions:


Priority 1 Removal—These trees have defects that cannot be cost effectively or practically treated, have a high amount of deadwood, and pose an immediate hazard to a property or person. Davey recommends that these trees be removed immediately.


Priority 2 Removal—These trees are not as great of a liability as Priority 1 Removals, being smaller and/or less hazardous, although they are also recommended for removal. Davey recommends that they be removed as soon as possible.


Priority 3 Removal—Trees designated for Priority 3 Removal do not pose a public hazard and are small, dead, or poorly formed. Smaller dead trees and failed transplants are in this category. Large trees in this category are generally poorly sited, of inferior quality, and pose little to no threat to the community.


Priority 1 Pruning—Trees in this category need pruning to remove hazardous deadwood limbs greater than four inches in diameter and/or have broken, hanging, or diseased limbs.


Priority 2 Pruning—These trees need pruning to remove hazardous deadwood limbs greater than two, but less than four, inches in diameter.


Large Tree Routine Pruning—Trees in this category have characteristics that could become risks if not corrected. Deadwood limbs are less than two inches in diameter.

(AATC note: This cateogry could include large or medium size trees, and refers to trees generally over 20 feet in height that cannot be pruned from the ground)


Small Tree Routine Pruning—This category includes small growing trees that can generally be maintained from the ground, i.e., crabapples, serviceberry, dogwood, etc., and other trees 20 feet or less in height.


Training Pruning—This category includes trees under 20 feet tall with correctable structural problems or minor amounts of deadwood that pose minimal threat of personal injury or property damage. Inexpensive pruning at this stage significantly affects the future of these trees. Young trees in this category that will be large at maturity generally require an annual pruning or inspection.

 

Condition Definitions

Excellent: The tree is nearly perfect in condition, vigor, and form. This rarely used category is generally applicable to small
trees or shrubs that have been recently transplanted and are well established. It also applies to large trees that have established themselves successfully in the landscape.


Very Good: Overall, the tree is healthy and satisfactory in condition, vigor, and form. The tree has no major structural problems, no mechanical damage, and may only have insignificant aesthetic,
insect, disease, or structure problems.


Good: The tree has no major structural problems, no significant mechanical damage, may have only minor aesthetic insect, disease, or structure problems, yet is in good health.

Fair: The tree may exhibit the following characteristics: minor structural problems and/or mechanical damage, significant
damage from non-fatal or disfiguring diseases, minor crown imbalance or thin crown, or stunted growth compared to adjacent trees or shrubs. This condition can also include trees that have been topped, but show reasonable vitality and show no obvious signs of decay.


Poor : The tree appears unhealthy and may have structural defects such as codominant stems, severe included bark, or severe
trunk and/or limb decay. A tree in this category may also have severe mechanical damage, crown dieback, or poor vigor threatening its ability to thrive. Trees in poor condition may respond to appropriate maintenance procedures, although these procedures may be cost prohibitive to undertake.

Critical: The tree has a major structural problem that presents an unacceptable risk, has very little vigor, and/or has an insect or
disease problem that is fatal and, if not corrected, may threaten other trees on the property.


Dead: This category refers to dead trees only.

 

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Last updated: 11/11/09