Minnesota First Detectors What’s in Your Woodpile? Gary Johnson Urban and Community Forester University of Minnesota

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.

Minnesota First Detectors

Firewood Quarantine Firewood quarantines State Federal International DNR RF-#### HT Exp DATE

Minnesota First Detectors Softwood versus Hardwood Softwoods have Tracheids (fibers), No Vessels (pores). Many have Resin Canals. Resin Canals

Minnesota First Detectors Softwoods versus Hardwoods Hardwoods have Fibers and Pores Pores

Minnesota First Detectors 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.

Minnesota First Detectors Ring Porous Wood: Black Ash

Minnesota First Detectors Ring Porous Wood: Bur Oak

Minnesota First Detectors Ring Porous Wood: American Elm

Minnesota First Detectors Semi Ring Porous: Black Walnut

Minnesota First Detectors Ring Porous versus Diffuse Porous Pores about same size and distributed evenly throughout growth ring = Diffuse Porous.

Minnesota First Detectors Diffuse Porous Wood: Basswood

Minnesota First Detectors Diffuse Porous Wood: Boxelder

Minnesota First Detectors Diffuse Porous Wood: Big Toothed Aspen

Minnesota First Detectors “Other” Features: Elm Bark Cross-Section Layered Bark of American and Rock Elm

Minnesota First Detectors “Other” Features: Long-Grain of Elm

Minnesota First Detectors “Other” Features of Oak: Rays Rays

Minnesota First Detectors Versus, No Rays in Ash Cracks or Checks, but not Rays

Minnesota First Detectors “Other” Features: Elm and Hackberry Both Have Wavy (tiretrack) summerwood

Minnesota First Detectors “Other” Features: Elm and Hackberry Hackberry has Corky Ridges on Bark, no Layered Cross-Section

Minnesota First Detectors “Other” Features: Red vs. White Oak Sodium Nitrite turns White Oak Heart Wood Blue to Purple

Minnesota First Detectors “Other” Features: Black Walnut Medium brown to dark chocolate heartwood.

Minnesota First Detectors Let’s Quiz the Log Splitter!

Minnesota First Detectors What is It?

Minnesota First Detectors What is it? 0 of Hackberry 2. Chokecherry 3. Crabapple 4. River Birch 5. Chokeberry

Minnesota First Detectors What is It?

Minnesota First Detectors What is it? 0 of Birch 2. Cottonwood 3. Big-Toothed Aspen 4. Silver Maple 5. Black Cherry

Minnesota First Detectors What is It?

Minnesota First Detectors What is it? 0 of Black Walnut 2. Buckthorn 3. Bur Oak 4. Boxelder 5. Ironwood

Minnesota First Detectors What is It?

Minnesota First Detectors What is it? 0 of White Oak 2. Hickory 3. Hackberry 4. Winged Euonymus 5. Bur Oak

Minnesota First Detectors What is It?

Minnesota First Detectors What Is It? 1. Cottonwood 2. Green Ash 3. Hackberry 4. Elm 5. Linden 0 of 30

Minnesota First Detectors What is It?

Minnesota First Detectors What is it? 0 of Elm 2. Boxelder 3. Silver Maple 4. Ironwood 5. Linden

Minnesota First Detectors What is It?

Minnesota First Detectors What is it? 0 of Black Pine 2. Black Cherry 3. Austrian Pine 4. Douglas Fir 5. White Cedar

Minnesota First Detectors What is It?

Minnesota First Detectors What is it? 0 of 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? 1. Linden 2. Sugar Maple 3. Black Ash 4. Elm 5. Green Ash

Minnesota First Detectors Questions… Gary Johnson UM Urban & Community Forester University of Minnesota Extension Foresters: Angela Gupta, Rochester Mike Reichenbach, Cloquet Gary Wyatt, Mankato