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Healthy Trees, Healthy Cities Phone App Healthy Trees, Healthy - - PowerPoint PPT Presentation
Healthy Trees, Healthy Cities Phone App Healthy Trees, Healthy - - PowerPoint PPT Presentation
Healthy Trees, Healthy Cities Phone App Healthy Trees, Healthy Cities Healthy Trees, Healthy Cities Creating a culture of stewardship that engages urban youth and community members in the planting, care, and stewardship of urban trees and
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Apple and Android App Stores
“Healthy Trees Healthy Cities”
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What does the app do?
The HTHC app has 5 modules:
- 1. Tree Stewardship
- 2. Pruning
- 3. Tree Health Monitoring
- 4. Early Pest Detection
- 5. Tree Planting
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What is the information used for?
NATIONAL LOCAL PERSONAL
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Year Trees Plots Trees/plot Miles Surveyed 2015 3646 58 62.8 29 2016 2084 35 59.5 17.5
New York
Year Trees Plots Trees/plot Miles Surveyed 2015 2690 100 26.9 50
Philadelphia Species # Trees Honey Locust 902 London Plane Tree 634 Callery Pear 389 Ginkgo 347 Pin Oak 341
New York
Species Found = 94 Species # Trees London Plane Tree 343 Plum/Cherry 314 Norway Maple 206 Red Maple 191 Honey Locust 133
Philadelphia
Species Found = 86
Most Common Species Most Common Species
2016: 7,000 Trees Surveyed w/ Casey Trees
Washington, D.C.
Summary
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Sample Design
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Early Signs Later Signs
Tree 36 Stress Index -0.783 Tree 71 Stress Index -.409 Tree 45 Stress Index -0.191
Tree 77 Stress Index 0.81
Tree 65 Stress Index 1.3 Tree 75 Stress Index -0.009
ത 𝑌 (𝑨𝑤𝑗𝑝𝑠 + 𝑨𝐸𝑓𝑔𝑝𝑚 + 𝑨𝐸𝑗𝑓𝑐𝑏𝑑𝑙 + 𝑨𝑈𝑠𝑏𝑜𝑡𝑞𝑏𝑠𝑓𝑜𝑑𝑧 + 𝑨𝐸𝑗𝑡𝑑𝑝𝑚𝑝𝑠)
Tree Stress Index Urban Tree Health Monitoring Non-Stressor Specific Evaluation of Tree Health
Variable Notes Discoloration Visual estimate Defoliation Visual estimate Transparency Digital estimate Dieback Visual estimate Crown Vigor Visual estimate
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Red Maple
Healthy Stressed
Stress Index (n = 107) (n = 191)
- Both cities show a similar range
in tree stress for red maple street trees.
- 20% of red maples in both cities
have a stress index greater than 1.6.
Red Maple in Philadelphia and New York % of trees measured
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Honey locust London plane Red maple 40% of red maples have no fine twig dieback while only 19% of honey locust have 0% fine twig dieback. Most trees regardless of species have less than 30% fine twig dieback.
Fine Twig Dieback
% of trees measured % Fine Twig Dieback
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Healthy Stressed
Stress Index
Transparency Dieback Discoloration Defoliation Results from a healthy red maple.
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Healthy Stressed
Stress Index
Transparency Dieback Discoloration Defoliation Results from a stressed red maple.
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Stress Index
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
% of trees measured
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Healthy Stressed
Stress Index London plane street trees (2015-2016). London plane street trees flooded during hurricane Sandy. Measured 2 years post Sandy (2014).
Example: Detecting new tree health issues.
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QUESTIONS
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