What is the best evidence of a drywood termite infestation?

The presence of fecal pellets is considered the best evidence of a drywood termite infestation because these pellets, often referred to as "frass," are a direct byproduct of the termites' feeding habits. Drywood termites consume wood and excrete fecal matter, which is typically small, dark, and resembles sawdust. Finding these pellets is a clear indication that termites are not only present but actively infesting the wood, as it suggests they have been feeding and are likely nesting in the structure.

While wood shavings may indicate some level of wood damage, they can also result from other factors or pests, making them less definitive. The visibility of termites themselves is strong evidence but may be somewhat rare or not observed until the infestation is significant. Discoloration of the wood can be a result of various issues, including moisture problems or other forms of damage, and does not specifically point to the presence of termites. Therefore, fecal pellets uniquely signify active infestation and are a reliable indicator used by inspectors to confirm the presence of drywood termites.