Diseases and Management of Big Leaf Maples in the Urban

Environment

●Roles of maples●Kinds of diseases●What problems are most prominent?●IPM – The big picture on maple management

Big leaf maple – Acer macrophyllum

Roles of Maples

What role do big leaf maples play in the urban environment?

How prominent are they, are new ones constantly being

planted, are they a tree people like, how many big leaf

maples are in urban areas compared to other areas, is there an aesthetic or other sort of value

associated with having bigleave maples around?

Big Leaf Maples

Big Leaf Maples●Background●Habitat and range●Native plant gardening / wildlife habitat●Wood / other value●Additional information (!)

Kinds of Diseases

What signs and symptoms do urban big leaf maples often show?

What kind of diseases do big leaf maples get?

Verticillium

V e r t i c i l l i u m

● Basic facts● Disease cycle● Symptoms (internal)

● Symptoms (external)

● Diagnosis● Control

What problems are most prominent?

Some prominent (most common, or most serious?) issues.

Diseases. Fungi, insect, bacteria, or people?

A simplified version of the life cycle of the disease.

How, where, how much, and from where?

IPM – The big picture on maple management

?Treatments? What kinds of treatments?

What is being done to manage big leaf maples in urban areas?

Big Leaf MaplesP R O H I B I T T E

D !Prohibited Street Trees for Seattle

City Ordinance No. 90047 names the following trees as prohibited:

●Acer macrophyllum (Bigleaf maple, Oregon maple). ●Populus trichocarpa, P. deltoides (Cottonwoods). ●Populus Nigra (Lombardy poplar).

These species have aggressive roots. The wood of some species is brittle and

breaks up in wind.

Planning and budgeting for urban forestry

“The Budget”

The future of big leaf maples in the urban environment

What does the future hold for the presence of big leaf maples in the urban environment?

What are the costs associated with managing urban big leaf maple trees?

● Management and upkeep costs● The costs in property damage and

personal injuries from danger trees

Questions?

Thank you!