Bark Lice on Oak Trees: Harmless Webbing

Deep South: 6-8 pin oaks (30-50 ft, 7-10 yrs) covered in white webbing from trunk to twigs and 3-5 ft on ground. Tank sprayer can't reach.

Diagnosis: Bark Lice (Psocids)

• "Tree cattle"—live in groups under silken webbing on hardwood bark (especially oaks).
• Feed on lichens, fungi, dead organic matter—do not harm tree.
• Webbing: silvery sheen on trunk/large limbs (not twigs/leaves).
• Populations peak in fall; winter cold reduces them.
• Range: Gulf Coast to South Carolina.

Management

• No control needed—beneficial scavengers.
• If webbing objectionable: strong water blast dislodges them.
• Insecticides only if homeowner insists (hire pro).
• Regularly sprayed trees rarely have them.

Auburn University bark lice info with photos.