What physical sign can indicate a termite infestation?

Frass or termite droppings serve as a clear physical sign of a termite infestation. Termite droppings are small, pellet-shaped excrement that can often be found near areas where termites are active, such as wooden structures or furniture. The color and consistency of frass can vary depending on the type of termite, but the presence of these droppings typically indicates that termites have been feeding on the wood in the vicinity. Homeowners and pest control professionals look for these signs to assess the extent of an infestation, as frass can accumulate on the ground or around entry points.

The other options do not indicate termite activity as directly as frass does. Honeycomb structures are associated with bees, while rust on metal surfaces is more indicative of moisture issues rather than pest infestations. Similarly, mold growth is usually associated with damp conditions and can signal water damage, but it is not a specific indicator of termite presence. Thus, the identification of frass is pivotal for diagnosing and addressing a termite issue.