Systemic bug control involves treating a structure or environment to create a zone of protection against pests. Chemicals are applied to specific areas where pests are likely to enter or congregate, creating a barrier that kills or repels them. By targeting specific entry points and areas of pest activity, systemic bug control aims to prevent pests from gaining access to the treated area and eliminate existing infestations. This approach is often used in homes, businesses, and other structures to protect against common household pests such as cockroaches, ants, and rodents.