What’s in Your Woodpile?

Minnesota First Detectors

What’s in Your Woodpile?

Gary Johnson & Angela Gupta

University of Minnesota Extension

Minnesota First Detectors

Minnesota First Detectors

Approved Firewood Required on State- Owned Land

Obtained from firewood distribution facility on State-owned land

Obtained from a firewood dealer approved by the DNR commissioner

DNR commissioner approved firewood.

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Minnesota First Detectors

Firewood Quarantine

Firewood quarantines State Federal International DNR

RF-#### HT

Exp DATE

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Softwood versus Hardwood

Softwoods have Tracheids (fibers), No Vessels (pores). Many have Resin Canals.

Resin Canals

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Softwoods versus Hardwoods

Hardwoods have Fibers and Pores

Pores

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Ring Porous versus Diffuse Porous

Large Pores in Earlywood and Small Pores in Latewood = Ring Porous Hardwood

Large, obvious lines are Earlywood.

Smaller,darker heartwood or lighter sapwood lines are Latewood.

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Ring Porous Wood: Black Ash

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Ring Porous Wood: Bur Oak

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Ring Porous Wood: American Elm

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Semi Ring Porous: Black Walnut

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Ring Porous versus Diffuse Porous

Pores about same size and distributed evenly throughout growth ring = Diffuse Porous.

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Diffuse Porous Wood: Basswood

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Diffuse Porous Wood: Boxelder

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Diffuse Porous Wood: Big Toothed Aspen

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“Other” Features: Elm Bark Cross-Section

Layered Bark of American and Rock Elm

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“Other” Features: Long-Grain of Elm

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“Other” Features of Oak: Rays

Rays

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Versus, No Rays in Ash

Cracks or Checks, but not Rays

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“Other” Features: Elm and Hackberry

Both Have Wavy (tiretrack) summerwood

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“Other” Features: Elm and Hackberry

Hackberry has Corky Ridges on Bark, no Layered Cross-Section

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“Other” Features: Red vs. White Oak

Sodium Nitrite turns White Oak Heart Wood Blue to Purple

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“Other” Features: Black Walnut

Medium brown to dark chocolate heartwood.

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Let’s Quiz the Log Splitter!

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Which log is hardwood?

Minnesota First Detectors

Which log is hardwood?

0%

0% 1. Log on the left2. Log on the right

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What is this?

Minnesota First Detectors

What is this?

0%

0%

0%

0%

0% 1. Oak2. Ash3. Walnut4. It’s hardwood; that’s all I need to know.5. I don’t know.

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What is this?

Minnesota First Detectors

What is this?

0%

0%

0%

0%

0% 1. Maple2. Oak3. Walnut4. Pine5. Don’t know.

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What is It?

Minnesota First Detectors

0%

0%

0%

0%

0%

What is it?

0 of 30

1. Hackberry

2. Chokecherry

3. Crabapple

4. River Birch

5. Chokeberry

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What is It?

Minnesota First Detectors

What is it?

0%

0%

0%

0%

0%

0 of 30

1. Birch

2. Cottonwood

3. Big-Toothed Aspen

4. Silver Maple

5. Black Cherry

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What is It?

Minnesota First Detectors What is it?

0%

0%

0%

0%

0%

0 of 30

1. Black Walnut

2. Buckthorn

3. Bur Oak

4. Boxelder

5. Ironwood

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What is It?

Minnesota First Detectors What is it?

0%

0%

0%

0%

0%

0 of 30

1. White Oak

2. Hickory

3. Hackberry

4. Winged Euonymus

5. Bur Oak

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What is It?

Minnesota First Detectors

0%

0%

0%

0%

0%

What Is It?

1. Cottonwood2. Green Ash3. Hackberry4. Elm 5. Linden

0 of 30

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What is It?

Minnesota First Detectors

0%

0%

0%

0%

0%

What is it?

0 of 30

1. Elm

2. Boxelder

3. Silver Maple

4. Ironwood

5. Linden

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What is It?

Minnesota First Detectors

0%

0%

0%

0%

0%

What is it?

0 of 30

1. Black Pine

2. Black Cherry

3. Austrian Pine

4. Douglas Fir

5. White Cedar

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What is It?

Minnesota First Detectors

0%

0%

0%

0%

0%

What is it?

0 of 30

1. White Cedar

2. Sugar Maple

3. Ponderosa Pine

4. Black Cherry

5. Douglass Fir

Minnesota First Detectors

What is It?

Minnesota First Detectors

What is it?

0%

0%

0%

0%

0%

0

30

1. Linden

2. Sugar Maple

3. Black Ash

4. Elm

5. Green Ash

Minnesota First Detectors

Questions…

Gary JohnsonUM Urban & Community Forester

University of Minnesota Extension Foresters: Angela Gupta, Rochester Mike Reichenbach, Cloquet Gary Wyatt, Mankato