Carpenter Ants in a 150-Year-Old Live Oak: Not a Tree Threat

Ecology

Carpenter ants nest in already decayed wood (heartwood rot, old wounds). They do not kill living tissue. Their excavation can actually slow decay by drying the cavity.

When to Act

Only if ants are entering the house from the tree. Then bait the colony (gel or granular baits placed on trails). Do not spray the tree—it harms beneficial insects and doesn't reach the nest.

Tree Health

Focus on the oak's vitality: mulch, water during drought, protect the root zone from compaction. A healthy oak compartmentalizes decay and outlives the ants.