Renovating Minnesota's Streets and Landscapes

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  

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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)

Tree Genetics Diversity: What is Good?

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?

Some Common Families Family Elm Family Rose Family

Birch Family Pine Family Olive Family

Some Common Genera Family

Genera

Elm Family

Elm, Hackberry

Rose Family

Crabapple, Mountain-ash Birch

Birch Family

Pine Family

Pine, Spruce, Fir

Olive Family

Ash, Lilac

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, HopHornbeam

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 ď Ż ď Ż

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 johns054@umn.edu; www.trees.umn.edu