Cedar Spruce Sap Sucker Damage: Bird-Caused Holes Misidentified as Borers

Damage Pattern Recognition

Cedar spruce with 2 cm holes, 4 cm apart, encircling trunk in horizontal rows ("string of beads"). Holes only in bark, not wood. Too high for children. Adjacent poplar unaffected.

Diagnosis: Sapsucker (Woodpecker) Damage

• Sapsuckers drill orderly holes → feed on sap
• Insects attracted to sap → birds return to eat insects
• Characteristic: horizontal rows encircling trunk
• Only bark penetration, not wood boring
• Species-specific (one tree targeted)

Impact Assessment

• Generally not harmful to healthy trees
• Trees compartmentalize small wounds
• Heavy repeated feeding can stress trees

Deterrent Strategy

Spray trunk holes with insecticide (malathion, Sevin, home defense sprays) to eliminate insect attraction → birds leave when food source gone.

Key Distinction

Not borers (random, deeper, sawdust). Sapsucker holes are orderly, shallow, horizontal rows. No structural threat unless extreme.