Climbing Spikes Damage Oak Trees: Why Wound Dressings Don't Help

Spikes Are Never Acceptable

Climbing spikes (gaffs) puncture bark, creating entry points for decay and insects. Never hire a tree service that uses spikes for pruning. Spikes are only for tree removal.

Wound Dressing Myth

• Research (Shigo, Shortle, 13+ years): Paints, sealers, tar, shellac—do not prevent decay or speed closure.
• They can trap moisture, promote fungal growth, and inhibit callus formation.
• Insects bore above/below dressed areas.
• Cosmetic only.

Proper Pruning = No Dressing Needed

Correct cuts (at branch collar) heal naturally. Improper cuts cannot be fixed by paint.

Action for Your Oaks

• Do nothing to the spike wounds—they will compartmentalize.
• Hire an ISA Certified Arborist (find one here) for future work.
• Verify climber uses ropes/saddle, not spikes.