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Disease • 25% have a level of disease that affects aesthetics Bacteria, viruses, and fungi can affect a tree’s leaves or trunk. Generally, these microbes had limited impact on overall tree health, and were mainly aesthetic concerns for cer-
RECOMMENDATION: Inspect elms and zelkovas for signs of Dutch elm disease, and monitor trees for signs of new diseases. Create a plan to prevent, identify, and respond to large-scale outbreaks of pests or diseases.
tain deciduous trees. Dutch elm disease, sudden oak death, and other diseases can have more severe consequences, and actions should be taken to limit the possible impact of these threats.
Trunk Health • 16% have wounds; 4% need to have these wounds traced to speed healing • 8% have internal decay • 3% have stakes or supports that need removal
RECOMMENDATION: Remove stakes and supports within 1 year of planting for all trees, and trace wounds as needed. These actions require very little staff time, but can have lasting impacts on tree health.
• 2% are leaning • 2% have cavities • 2% have termites • 1% have borers
The health of observed trunks was generally good; however, there are a number of trees that have uneven wounds that will not heal quickly, or stakes and supports that can constrict circu- lation. These issues can kill a tree if unchecked, but are easy to address if caught early.
Other
• 5% have foliage discoloration • 4% need to be removed and replaced • 3% require additional inspection
Some trees showed foliage discoloration, which may result from drought stress, lack of nutrients, disease, or other factors. Others need to be removed entirely due to their health or structural problems, or have follow-up inspections to identify and assess issues in further detail.
Trunk Health
Young maple tree with trunk wounds that should be traced with a sharp knife to speed healing and reduce decay
Borer hole in a Shumard oak
Supporting guide lines, if left on too long, can severely injure and kill young trees.
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