renovating minnesota's streets and landscapes
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Renovating Minnesota's Streets and LandscapesTRANSCRIPT
Renovating Minnesota’s
Streets and Landscapes
Introducing Genetic Diversity to the
Canopy
The Problem With Minnesota’s
Landscapes
Three Genera = 52.5% of All Trees
Maple 20.2% Ash 15.2% Spruce 18.1%
Maple Problems
Verticillium Wilt – a Vascular Disease
Stem Cankers – Fungal Infections of
Weakened Trees
Asian Long-Horned Beetle – Insect Pest that
Favors Maples
Deicing Salt – There’s no Tree More
Susceptible than Maple
Maple Problems
Ash Problems
Emerald Ash Borer
Ash Yellows
Verticillium Wilt
Ash/Lilac Clearwing Borer
Ash Problems
Spruce Problems
Rhizosphaera Needlecast
Cytospora Canker
Yellow-Headed Spruce Sawfly
White Pine Weevil
Spruce Problems
Can Anyone
Save our
Trees?
First of All, You Can Save Your Ash
Imidachloprid Soil Drenches
Tree-Age Trunk Injection
Tree Genetic Diversity
By Form (phenotype)
By “Species” (genotype)
A Genetically Diverse Landscape: 30:20:10
No more than 30% in same Family No more than 20% in same Genera No more than 10% in same Species
What does THAT mean?
Tree Genetics Diversity: What is
Good?
Elm Family
Rose Family
Birch Family
Pine Family
Olive Family
Family
Some Common Families
Elm Family Elm, Hackberry
Rose Family Crabapple,
Mountain-ash Birch Family Birch
Pine Family Pine, Spruce, Fir
Olive Family Ash, Lilac
Family Genera
Some Common Genera
Working in Diversity: Try These Trees
Trees for Streets
Trees for Parks
Trees for Lawns
Northern Pin Oak
‘Prairie Horizon’ Manchurian Alder
‘Dura Heat’ River Birch
‘Dakota Pinnacle’ Asian White Birch
‘Prairie Dream’ Paper Birch
Muscle Wood, Blue Beech, Hop-
Hornbeam
Ironwood, American Hornbeam
‘Northern Acclaim’ Honeylocust
‘Purple Robe’ Locust
‘American Sentry’ Linden
‘Frontyard’ Linden
‘Ivory Silk’ Japanese Tree Lilac
Balsam Fir
American Larch
White Pine
‘Snowcloud’ Serviceberry
‘Snowbird’ Hawthorn
‘Pink Spires’ Crabapple
‘Selkirk’ Crabapple
‘Mountain Frost’ Ussurian Pear
‘Prairie Gem’ Ussurian Pear
Showy Mountain-Ash
‘Prairie Sky’ Poplar
‘Prairie Cascade’ Willow
Getting These Trees
All Listed in Bailey Nurseries, Inc. catalog
Any Garden Center or Retail Nursery can
purchase them from Bailey Nurseries
Gary Johnson
Urban and Community Forestry
Department of Forest Resources
University of Minnesota
[email protected]; www.trees.umn.edu