Why Is There White Webbing on My Tree Trunk?

Understanding Bark Lice on Houston Trees

Bark lice (also called Psocids) are tiny, soft-bodied insects that live on tree bark. They feed on organic debris, algae, fungi, and lichen — helping to clean the bark's surface rather than harm it.

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A Sign of Nature at Work

Bark lice do not damage healthy trees. Their presence usually indicates a rich micro-ecosystem on the bark surface. However, a sudden increase may suggest environmental stress — such as drought, compacted soil, or poor air circulation.

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A Sign of a Healthy Ecosystem

Ironically, seeing bark lice can mean your trees are doing well. They thrive where there's good moisture and plenty of organic growth on the bark. So, while it might look strange, it often means your landscape is supporting a healthy mix of microorganisms.

"The Ghost Web" Phenomenon

In late summer, homeowners sometimes wake up to find their tree trunks wrapped in silky white webbing overnight — it looks like Halloween decorations, but it's actually bark lice at work! The webbing isn't a sign of danger; it's their protective covering while they clean the bark surface. Within a couple of weeks, the "ghost web" disappears as the insects move on.

Managing Bark Lice

• Maintain proper watering and soil health.
• Avoid unnecessary pesticide use — bark lice disappear on their own once they finish feeding.
• Schedule routine tree inspections to catch any early signs of stress.
• If populations are large or your tree looks unhealthy, a tree care professional can evaluate underlying issues.