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Diagnosing Tree Problems

We’ve all seen seemingly healthy trees fail. Once the tree is removed, a hollow center reveals the cause of this tree failure.

Arborists now have a minimally invasive tool that helps them diagnose the soundness of a tree. This information can help them diagnose tree problems and reduce the risk of unexpected tree failures that create a hazard for people and property.

An electronic high-resolution needle drill makes a fine hole in the tree. As it travels through the trunk it measures the resistance encountered. A print out is produced, mapping out the internal structure of the tree.

The graph line aligns with the decay pattern inside the trunk.

Arborists use the results of this measuring tool to get a look inside sick and declining trees. These test results can help them determine if a tree is a hazard and should be removed or one that can be saved.

A bit more information: A hazardous tree is one that can cause damage to people or property when it fails. Though not always easy to detect, see the Friends of Tree City USA bulletin #15 for tips on spotting and avoiding hazardous trees. And consider working with a certified arborist to keep your trees healthy, detect and manage or remove hazardous conditions.

Upcoming
Events & Webinars

Mar. 18, 2026
FREE WEBINAR:
Patio, Deck and Balcony Gardens

Register here

March 21 & 28, 2026
REALTORS Home & Garden Show
West Allis, WI
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March 24, 2026
SC Johnson Golden Rondelle Theater
Community Program

Racine, WI
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March 26, 2026
FREE WEBINAR: 
Getting Started Growing Vegetable and Flower Gardens
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April 1, 2026
FREE WEBINAR: 
Growing a Bountiful Harvest 
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April 9, 2026
FREE WEBINAR:
7 Steps to Managing Water on Your Property

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April 11, 2026
A Day in the Garden
Fond du Lac, WI
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April 18, 2026
3rd Annual Spring Rally
Oshkosh, WI
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April 19, 2026
Ebert's Greenhouse Village
Ixonia, WI

April 23, 2026
Iowa State University
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April 25, 2026
Pasquesi Home & Gardens
Lake Bluff, IL

April 26, 2026
Ebert's Greenhouse Village
Ixonia, WI

May 2, 2026
Ebert's Greenhouse Village
Ixonia, WI

May 6, 2026
FREE WEBINAR: 
Adding Native Plants
to Any Size Gardening Space

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May 7, 2026
Wauwatosa Public Library
Wauwatosa, WI

May 9, 2026
Ebert's Greenhouse Village
Ixonia, WI

May 10, 2026
Ebert's Greenhouse Village
Ixonia, WI

May 13, 2026
Roots & Branches
West Bend, WI
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May 16, 2026
Ebert's Greenhouse Village
Ixonia, WI

May 17, 2026
Ebert's Greenhouse Village
Ixonia, WI

May 21, 2026
FREE WEBINAR: 
Planting & Care of Your Rain Garden
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June 3, 2026
FREE WEBINAR: 
Managing Your Landscape
with Pollinators in Mind

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Sept. 3, 2026
FREE WEBINAR: 
Tree Planting and Care
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Sept. 12, 2026
Knowledge in Bloom Conference
Milwaukee, WI
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Sept. 17, 2026
FREE WEBINAR:
Fall Landscape Care and Planting

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