What purpose do rodenticides used in perimeter rodent control serve?

Rodenticides used in perimeter rodent control primarily serve to help prevent rodent entry into establishments. This approach focuses on creating a barrier between the exterior environment, where rodents may thrive, and the interior of buildings, which need to be kept free from pests. By targeting the perimeter, these rodenticides can effectively reduce the population of rodents before they can access the structure, thus mitigating the risk of infestations.

Using rodenticides in this manner is part of an integrated pest management strategy that aims to manage rodent populations around the facility. It helps to control the availability of food and shelter, making the environment less hospitable to rodents and discouraging them from invading the premises.

The other options described do not encompass the primary role of perimeter rodenticides. Some may suggest that they eliminate existing rodents, attract pests, or serve other functions unrelated to control, but the specific application of these chemicals in this context is aimed at prevention rather than direct elimination of established populations or interaction with traps or other pests.