Which method is NOT typically recommended for treating visible termite infestations?

Insect growth regulators (IGRs) are a class of chemicals used to disrupt the development and reproductive cycles of insects, including termites. While IGRs can be effective in managing pest populations over time, they are typically not used as a primary method for treating visible termite infestations. The reason for this is that IGRs do not immediately eliminate existing termites; instead, they work gradually to prevent future generations from maturing and reproducing.

On the other hand, direct liquid applications, baiting systems, and soil treatments deliver immediate results by either killing termites on contact or eliminating them through ingestion. Such methods are designed to address active infestations promptly, which is critical in the context of visible termite presence. Baiting systems can also provide ongoing control and monitoring but are typically more effective as part of a comprehensive treatment strategy rather than as a sole solution when an infestation is visible.

Overall, while IGRs can play a role in an integrated pest management approach, they are not typically recommended for immediate treatment of existing infestations, which is why this choice stands out in this context.