Follow-up frequency is critical in controlling German roach infestations. Quicker follow-ups allow for faster identification of new infestations and elimination. Guidelines for follow-up service frequency: Initial follow-up: Inspect the effectiveness of the treatment within a few days of the initial service. Regular follow-up: Inspect the infestation at regular intervals, usually every 2-4 weeks, based on its severity. Long-term follow-up: Once the infestation is under control, continue to inspect at least every 3-6 months to prevent re-emergence. Note that the frequency of follow-up services may vary based on the severity of the infestation and the risk of reinfestation. By adhering to these guidelines, you can effectively manage and maintain control over the pests.