Minnesota First Detectors

Emerald Ash Borer

Minnesota First Detectors

EAB Lifecycle

David Cappaert, MSU

EAB Life Cycle

Minnesota First Detectors

Host Trees

David Cappaert

Black ash

White ash

Green ash

Blue ash

Manchurian ash

Susceptibility

low

high

Green ash(througout

MN)

Black ash

White ash

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Host Trees

EAB and white fringetree (Chionanthus virginicus)

4 infested trees in OH, under drought stress

< 5% of urban trees in SE MN

Lilac and privet tested and not considered suitable hosts

http://www.plantplaces.com

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How Does EAB Kill Trees?

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Recognizing EAB

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EAB Positive

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EAB Negative

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EAB Suspect

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Native Ash Borers

Flatheaded borers

Roundheaded borers

Clearwing borers

Ash cambium miner

Ash bark beetle

Carpenterworm

William H. Hoffard, USDA Forest Service

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Diagnostic Symptoms

“S” shaped galleries

EAB Larva

Minnesota First Detectors Diagnostic Symptoms

“D” shaped exit holes EAB Adult

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Life Stages – Adults

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Similar Damage is Found in Many Tree Types

Oak Birch Aspen Honey locust Walnut Boxelder Many others

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Progression of EAB Symptoms

Increasing Numbers

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Nodine – Found 2011 ~6-7 years old at discovery

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Olmstead Co. – Found 2014~5-6 years old at discovery

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Fort Snelling Golf Course – Found 2012~4-5 years old at discovery

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St Paul – Found in 2009, ~4 years old at discovery

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Summit / Dale – Found in 2011, ~4 years old at discovery

Decline, woodpecking, bark cracks on < 10 trees

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Shoreview – Found in 2011, ~3 years old at discovery

Decline in one tree initially

No woodpecking seen in July

Heavy woodpecking by November

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Wildlife Refuge – Houston County

Houston Estimate 3 years old

when found in 2010 Only found due to

extensive searching