See a tree topping incident in progress - photos and description posted at Steamboats.com
See another before-and-after case
Instructions for proper pruning - Steamboats.com
"No Topping" Sign Developed The Father of Arboriculture, John Davey, called them "Tree Fools", those who top their trees, and those who allow their trees to be topped . . . A company has taken steps to permanently educate communities with the message "Tree Topping Hurts". A sign that when placed in a community gives a daily reminder that tree topping is not a welcomed or desirable practice.
Topping is perhaps the most harmful tree pruning practice known - City of Walnut Creek
Proper Tree Pruning Does Not Include Topping Your Trees, by Colorado State University Cooperative Extension, Denver County
Selecting a tree trimmer (arborist) by Colorado State University Cooperative
Don't Destroy Your Large Trees by Topping More info. from Colorad State University Cooperative Extension
Why Topping Hurts Trees Topping is perhaps the most harmful tree pruning practice known. Yet despite more than 25 years of literature and seminars explaining its harmful effects, topping remains a common practice. . . .
Tree Topping Hurts Info. from the Tree Doctor
Topping is the worst thing you can do to your trees more info. from the Tree Doctor
Topping a tree is NOT recommended - from Horticulture Solutions Series, University of Illinois
What's bad about tree topping Illinois Department of Natural Resources
Two Myths About Tree Topping Illinois Department of Natural Resources
Please don't top your trees . . . from the International Society of Arboriculture, Pacific Northwest Chapter
Download a PDF file: Tree Topping Hurts Trees
Tree topping is bad for your trees - Gardening Information from Oregon State University Extension
The Anti Tree-Topping Page Don't let this happen to your trees!
The National Arbor Day Foundation
ArborCare Library Eight good reasons why not to "top" trees
Should it be illegal?
A law against tree topping
City of Redding Comprehensive Tree Plan calls tree topping inappropriate
Homeowners, tree toppers sued The city settled a civil lawsuit Tuesday for $170,000 against five homeowners and three tree-trimmers who allegedly hacked off the tops of 59 trees at La Costa Canyon Park . . . The city sought a minimum of $134,495 in damages, based on an estimate by a city arborist, and city officials also wanted to include punitive civil measures.
Guidelines for Developing and Evaluating Tree Ordinances
Professor's Message, by Jeff Iles, Iowa State University, published in City Trees, The Journal of The Society of Municipal Arborists
Tree topping hurts - info. from Cortese Tree Specialists, Knoxville, Tennessee
Tree topping - info. from John A. Keslick Jr., Tree Biologist, Tree Anatomist & Professional Modern Arborist
Tree Topping Hurts Trees Forestry-Sales.Com, Inc., Member of Ohio Forestry Association
Tree Tooping, or How to Create a Disaster, by Paul Hetzler, Community Forestry Program, Cooperative Extension of St. Lawrence County
Urban Forest Tree Foundation of Kern: . . . a bizarre and disturbing practice known as tree topping is devaluing Bakersfield trees and neighborhoods at an alarming rate.
Experts Agree Don't Top Your Tree
No Tree Topping Download this PDF file from Spokane Universtiy
Tree Topping a few words from Cuivre River Electric Cooperative, Troy, Missouri
NeighborWoods training spotlights do's and don'ts of tree care, Olympia, Washington
The Dark Side of Urban Tree Topping, by John Tasan and Zakariya Abdullah, Faculty of Forestry, Universiti Putra Malaysia
Don't Top Trees - City of Greensboro, Urban Forestry Program
California Forest Stewardship Program California State Government tips on proper pruning
ufei.org Urban Forest Ecosystems Institute - urban wood, information and links to everything trees.
Tree Doctors if you live in the Phoenix area, here are some good tree trimmers who respect the trees and trim correctly