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Carpenter ant (Camponotus herculeanus)

Hevosmuurahainen

The carpenter ant is the largest ant species in Finland and can cause significant structural damage to buildings. It does not eat wood but excavates it to build its nests, which can weaken structures over time.

Identification

The carpenter ant is large (6–15 mm), black, and moves alone. It leaves traces in wooden structures when nesting indoors.

Habits

The carpenter ant:

  • nests in decayed or damp wood (e.g., wall and floor structures, storage buildings)
  • lives in colonies that can grow to thousands of individuals
  • can travel extensively inside structures, especially in spring and summer
  • is nocturnal and difficult to detect in the early stages

Signs of infestation may include:

  • rustling sounds from inside walls or floors
  • crumbling or shredded wood material
  • occasional large ants seen indoors

Control

If a carpenter ant infestation is suspected, immediate professional pest control is recommended. DIY methods are usually ineffective, as nests are often hidden deep within structures.

A professional pest controller will:

  • perform an inspection and locate the nest(s)
  • carry out treatment using effective insecticides
  • make repeated visits if needed and provide repair instructions
  • give guidance on structural protection and prevention

Repairing damaged or rotting wood is essential for a long-term solution.

Summary:

Carpenter ants can cause structural damage by tunneling into wood to build nests. They are active in spring and summer and may live unnoticed in buildings for years.

Fast, professional pest control is crucial to locate and eliminate the nest before serious damage occurs.

Pest control visits from 179€