Pin knots in walnut trees are defects caused by what process?

Pin knots in walnut trees are defects caused by what process?

• A. Natural resin pockets.
• B. Defects resulting from suppressed dormant buds that may not break through the bark.
• C. Insect damage caused by borers.
• D. Areas of abnormal wood density.

Answer: (B)

Pin knots form when dormant buds along the walnut stem are suppressed and fail to push through the bark during growth. Each suppressed bud ends up embedded in the growing wood, creating a tiny knot as the tree adds annual rings around it. This makes the wood appear with small, inconspicuous knots that disrupt grain and reduce lumber value. It isn’t caused by natural resin pockets, insect damage, or abnormal wood density.

Pin knots form when dormant buds along the walnut stem are suppressed and fail to push through the bark during growth. Each suppressed bud ends up embedded in the growing wood, creating a tiny knot as the tree adds annual rings around it. This makes the wood appear with small, inconspicuous knots that disrupt grain and reduce lumber value. It isn’t caused by natural resin pockets, insect damage, or abnormal wood density.