White Sticky Webbing on Tree Trunks in Houston: Harmless Bark Lice

Silvery Webbing Engulfing Tree Trunks? It's Bark Lice (Psocids)

In Houston and along the Gulf Coast, fine silken webbing on oak and crepe myrtle trunks in fall is produced by bark lice. They are harmless scavengers feeding on lichens, fungi, and dead bark—not your tree.

Key Facts

• Webbing on bark only, not leaves.
• Tiny insects (1/4") underneath; move in groups.
• Seasonal: peak in fall, decline in winter.
• No damage to tree; beneficial clean-up.

What to Do

• Nothing. They will disappear with cool weather.
• If webbing bothers you, blast with hose.
• Do not spray insecticide—harms beneficials.
• Safe for pets (Lhasa Apso).

Learn more: Auburn University Bark Lice Bulletin