When feeding on wood, which part do subterranean termites typically consume?

Subterranean termites primarily consume soft springwood, which is found between the outer bark and the inner heartwood of a tree. Soft springwood consists of younger, less dense wood fibers that are easier for termites to digest compared to the harder, denser heartwood. The soft springwood's composition allows termites to efficiently extract the cellulose they need for nourishment.

In contrast, heartwood is much more challenging for termites to consume due to its density and lower cellulose content, making it less appealing as a food source. Bark is the outer protective layer of the tree, which is not a preferred food for termites and primarily serves to protect the inner parts of the tree. Hardwood, while broader in category, refers to a dense type of wood that is typically more resistant to termite damage, as it often contains less digestible cellulose. Therefore, through their feeding behavior, subterranean termites demonstrate a clear preference for the softer, more digestible parts of the wood, which is specifically soft springwood.