In which situation is it unnecessary to post pesticide application signs?

Pesticide application signs serve as a crucial communication tool to inform the public about recent pesticide treatments and the potential risks involved. In the case of homes under service contracts, it is typically unnecessary to post pesticide application signs because these treatments are often conducted in private residences where the occupants have already consented to such services as part of their agreement with the pest control company. The homeowners are generally aware of the treatment schedules, and the need to alert the general public, as with community spaces like parks or schools, is not present.

In contrast, public parks, school properties, and agricultural fields are areas frequented by the public or where people may not have prior knowledge of pesticide applications. In these scenarios, signage is important for safety and transparency, ensuring that individuals can take precautions if necessary. Thus, in homes with service contracts, the lack of requirement for signage is based on the understanding and agreement of the individuals living in those spaces, making it unnecessary.