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Tree Care

In this Tree Care Symposium, we look at how tree populations are changing and consider approaches to selecting species adaptable to climate change.  We also examine practices for moving and planting trees effectively and review diagnostic practices.

Fee: $80 includes morning continental breakfast and lunch.

Revised schedule equals 4 contact hours; revised CEUs in progress from MAC-ISA and LACES

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Thursday, March 22, 2018
10:00 am - 3:30 pm
Event Details


UPDATES as of 12 pm, Wednesday, March 21


Kelly Education Center

10:30 am
The Practical Limits of Tree Diversity
Gary Watson, Lead Scientist, Arboriculture, Morton Arboretum

Diversity is often lacking in the urban forest. Fewer than 10 species can account for 50%, or more, of the urban tree population. These overplanted species tend to be hardy and capable of surviving on difficult urban sites. But urban areas can also be repositories for a wide range of species, though most are planted in very small numbers because site quality is limiting. A 2010 i-Tree Eco assessment of the Chicago metropolitan region showed that the urban forest was in a transitional state where older trees were reaching the end of their lifespans, hardy planted species were increasingly being lost to introduced pests and pathogens, and smaller, lower-quality invasive and opportunistic species were the most widespread. We can use this kind of data to predict change in the species composition and structure of the forest over time. Sites with lesser quality urban soils that currently support hardy trees will have to be improved to support a diverse and sustainable urban forest of more sensitive species.

Using Applied Climate Science Modeling to Develop Forestry Management Strategies
Shawn Kister, Director, Grounds, Longwood Gardens, Kennett Square, PA

11:30 am
Diagnosing Tree Disorders
Jim Flott, President, Community Forestry Consultants, Inc., Spokane, WA

The term “Tree Doctor” implies that such a professional can effectively diagnose a plant health problem and offer advice or prescriptions for resolving it. Although not known as tree doctors these days, arborists are often called upon by their clients for exactly this service. Diagnosing plant health problems takes specialized knowledge and experience. Some diagnoses are straight-forward when dealing with common problems; however, other plant health issues can be frustrating to diagnose in cases when symptoms are elusive or when circumstances conspire to obscure the signs that something might be wrong. The best plant health diagnosticians out there will tell you that it takes decades of study and diligent practice to get really good at it–and even then, the most experienced will still consult textbooks and research articles to help verify their conclusions. This lecture presents diagnostic steps to answer “What is wrong with my plant?”.

12:30 – 1:30 pm lunch (Robins Room, Robins Vistors Center)

1:30 pm
The Practical Science of Planting Trees
Gary Watson

Sound tree planting practices must be based on sound science.  This presentation, based on the ISA book of the same title, is an up-to-date synthesis of the research devoted to planting urban trees that can be used to understand and implement the appropriate practices that are vital to planting trees that will last a lifetime.  Future tree problems can be minimized through proper site preparation and selection, and understand the biology of tree responses during digging, planting, and establishment at the new site.

2:30 pm
At the Root – Moving Large Trees Economically
Jim Flott

Bare root transplanting has been used for centuries. It is the root of the nursery industry. The demand for immediate effect in the landscape or desire to retain existing trees in the landscape can be met by successful bare root transplanting of larger trees economically. Transplanting large diameter trees bare root is not new but the mechanics of harvesting and transportation are new. This presentation reviews the process of moving large diameter trees bare root.

3:30 pm Adjourn

REVISED 3.75 contact hours, 3.75 MAC-ISA CEUs, 3.75 HSW LACES (updates to hours are being sent to MAC-ISA and LACES)