when hugging trees is not enough
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When Hugging Trees is Not
Enough
Tree Care Advisor Core Course Training 2012
Making Tree Health and Condition Decisions
Three (completely arbitrary) Perspectives
1. Look Good, but Dangerous.
2. With the Right Amount of Chemicals…They
Might Be Okay.
3. Too Big or Too Small
Photo by Nancy Rose
One Example of Decision-Making
Saving the Tree/Trees is Critical
Historically Significant
Majority of Canopy Cover
Tree/Trees not Critical
One Tree of Many
Use of Area Has Changed
Tree Was a Volunteer
The Tree/Trees Critical to the Landscape
VS
This
This?
One Example of Decision-Making
The Problem May Be Safety (Risk Related)
Correctable Long-Term Correctable
Short-Term Only Correctable
Not Correctable
The Problem May Be Health
Manageable Culturally Correctable
Chemically Dependent
Not Manageable
Safety Versus Health Issues
Safety, or….
Health?
I. Good-Looking, but Is It Dangerous?
Danger Categories
Got Off to a Bad Start
Damaged by Construction
Weakened by Decay
Got Off to a Bad Start
Poor Architecture
Propagation/Production Issues
DED Resistant Elms: Aggressive Growth
Aggressive Elms
Poor Architecture: DED Resistant Elms
Elms in Production: Prune 2-3 Times Per
Season
Bad Forms Catch Up: Removal is Only
Option
Bad Forms Catch Up
Correct Now, or… Remove Tree Later
Decision-Making on Weak Attachments
Remove the Attachment (young trees)
Removal Delayed: Larger Wounds
Waited Too Long: Not Correctable
When it is Too Late to Correct
Is It Too Late?
A Chance to Save Them: Pruning and
Cabling
Propagation/Production Issues
Stem Girdling Roots
Some Begin Here
Stem Girdling Roots
Some Begin Here
The Consequences of Burying Trees
Stem Girdling Roots
SGRs Correctable at This Stage
Exposure of Problem
SGRs Correctable at This Stage
Correction of Problem
Stem Girdling Roots: Not Correctable
Symptoms Too Advanced
SGR Problem Not Correctable
SGR Problem Not Correctable: >50% of
Stem Circumference Compressed
Stem Girdling Roots: Correctable?
Hackberry
Stem Girdling Roots: Problem Corrected?
Correcting Root Depth Issues
Photo: E. Berg
Depth Problem: Too Late?
Green Ash
Depth Problem Corrected – 7 yrs. Later
Depth Problem Corrected – 7 yrs. Later
Ohio Buckeye
Depth Problem Corrected? Autumn Blaze
Maple, 4 yrs. Later
Autumn Blaze Maple, 4 yrs. After
Correction
Damaged by Construction
Define the Damage
Evaluate the Species
Evaluate the Health
Step One: Define the Damage
Stem Wounds, Broken Branches
Root Loss
Soil Disturbance
Microclimate Disturbance
Disease and/or Insect Problems
Wounding, Broken Branches Least of the Problems – Inciting Events
Generally Easy to Treat
Long-Term Effects Negligible
Trunk & Buttress Roots Wounds? Bigger
Issues.
Photos by D. Fallon
Trunk & Buttress Roots Wounds?
Is the Problem Stem Wounds and Broken
Branches?
Photo by Ken Arndt
Root Loss
Direct Root Loss
Indirect Root Loss
Water and Oxygen Restriction
Soil Microflora Altered
Soil Chemistry Altered
Root Growth Restricted
Rhizosphere Temperature Extremes
Direct Root Loss: On the Streets
This Caterpillar is
Much Worse than
Gypsy Moths!
Direct Root Loss
Direct Root Loss
Healthy Trees Often Recover From 1-Sided Root Loss
Direct Root Loss
2-Sided Root Loss is More Serious
Direct Root Loss
Oooooh, 3-Sided Root Loss? Do You Want the Tree to Live?
Direct Root Loss
4-Sided Root Loss? I’m Not Parking Here!!!
Direct Root Loss – One Sided
Trees Were Healthy, but Unstable
Photo Eric Berg
Photo: J. Ryg
Can It Get Worse?
Direct Root Loss
Even Green Ash
Has Its Limits
Indirect Root Loss: Water and
Oxygen Restriction
Photo by B. Johnson
Typical Tree Reaction: Defensive Die-
Back and Clumped Growth. Remove.
Photo: R. Kennedy
Identify the Species: Tolerance Dependent
on Type of Damage
“Tolerant” Species
Bur Oak
Silver Maple
Elms
Tamarack
Crabapples
Birches
Hackberry
“Intolerant” Species
White Oak
Sugar Maple
White Pine
Douglas-fir
Ironwood
Hemlock
Hickories
Evaluate Health
Younger Trees Better
Groups of Trees Better
Starch Test Before
Water Management
Monitoring: Aerial Photography CIR
September,
1997
Monitoring: Aerial Photography CIR
September,
1999
II. With the Right Amount of Chemicals,
They Might be Okay
Chemicals for Health
Chemicals as Preventatives
Chemicals as Lifelines
Chemicals for Health: Grandfather Oak:
Paclobutrazol, Root Stimulants, O.M.
Species: Bur Oak
(Quercus
macrocarpa)
Size: 27" diameter
Crown diameter: 45
feet
Estimated age: 150
years
Estimated life
span: 250 to 350
years
Tree Health:
Excellent (based on
consultant's tests)
Environmental Liabilities: Remove
Poor Condition – Small Canopies
Environmental Liabilities: Decision? It’s a
Bur Oak.
Solitary, Poor Health, Poor Condition
Environmental Liabilities: Decision?
Solitary, Poor Health, Poor Condition
Environmental Liabilities: Decision?
Solitary, Limited Site Potential and Small
Environmental Liabilities: Decision?
High Maintenance Tree – High Risk Potential
All Oaks (white and bur) in Oak Wilt
Area: Preventative Treatment or Not?
Impacts of Emerald Ash Borer
David Cappaert, , www.forestryimages.org David Cappaert, , www.forestryimages.org
75% Ash Neighborhood: Preventative
Chemicals? Lifeline Chemicals?
What’s that doing
Here?
Too Big or Too Small
Infrastructure Conflicts (Risk issue)
Inadequate Space (Risk & Health issue)
Infrastructure Conflicts: Remove/Keep?
Photos: D. Hanson
Infrastructure Conflicts: Remove/Keep?
Photos: Jacob Ryg
Infrastructure Conflicts: Remove/Keep?
Photo: T. Teynor
Infrastructure Conflicts: Remove/Keep?
Photo: D. Hanson
Not Enough Space: Urban “Core” Trees
7-10 Year Lifespan?
Save or Retain Trees: Bicolor Oak on Left,
Black Ash on Right?
Knowing Failure is Likely, Retain or
Remove Planting to the Right?
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