Rodding should only be used when?

The correct answer relates to the application of termiticides in scenarios where access below concrete surfaces is necessary. Rodding is a technique employed specifically for introducing termiticide beneath sidewalks or patios where direct access may not be available due to these solid surfaces. This method ensures that the treatment effectively reaches the soil where termites may be present, creating a protective barrier against potential infestations.

The focus on situations that require a controlled and precise application of chemicals is crucial in pest management. Rodding, as a technique, helps in achieving that by allowing pest control professionals to inject the termiticide directly into the soil without needing to remove any structures above it, which could be disruptive and labor-intensive.

In contrast, drilling holes in wood structures or spraying around the perimeter of a building do not necessitate the rodding method, as they employ different methods of application. Drilling aims to treat the wood directly while perimeter spraying targets immediate surfaces and does not reach below barriers like sidewalks or patios. Creating trenches for drainage is also unrelated, as it pertains to site management and not to pest control methods. Thus, the specificity of rodding in introducing termiticides under solid surfaces solidifies its correct application context.