When using the rodding method for termiticide application, what is a crucial requirement regarding rod holes?

When using the rodding method for termiticide application, the crucial requirement is that the rod holes must extend below the bottom of the footing. This is important because it ensures that the termiticide reaches the active pathways of termites, which often exist below the structural elements of a building. By penetrating below the bottom of the footing, the application can effectively target the areas where termites are likely to enter, providing better protection against infestations.

Additionally, this depth helps to create a barrier that prevents termites from accessing the wood components of the structure from below, which is essential for effective pest control. Adequate penetration is necessary for the chemical to be effective in reaching termite colonies that may be buried or nesting in the soil beneath the structure.

While the other options refer to important considerations in pest control practices, they do not specifically address the critical aspect of where the rod holes must extend to ensure an effective treatment application against wood-destroying pests.