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Pitch Pocket
- Insects cause injury to the bark, leading to formation of gum spots in the wood
- Common in Cherry
Worm Track
- Also called pith fleck
- Small, narrow, yellowish to brownish streaks 1/32” to 1/16” wide and
- 1/8" to 2" long
- Caused by insects, whose burrows are filled in by new cell growth
Worm Hole
- Caused by worms
- Tunnel size ranges from 1/64” to 3/16”
- Wood moisture content must be above 30% for oak timberworms to continue activity
Incipient Rot
- Also known as decay, is the decomposition of wood by fungi. Incipient rot is rot in the early stages
- Slight discoloration or bleaching of wood
- Wood moisture content must be above 30% for rot-causing fungi to grow
Ray Flecking
- Stripes of cells that extend radially
- Rays store food and transport it horizontally
- Most common in Red Oak and White Oak
- Visible in hardwood types that are quartersawn and have rays
- Examples show ray flecking with variations in ray width
Mineral Streak
- Darkened or discolored wood area
- Blackish-blue, well-defined streak running parallel with grain
- Caused by minerals which the tree extracts from the soil
- May also be called mineral stain
- Common in Maple and Birch, occasionally in Oak and Cherry
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