What type of pesticides can only be purchased and used by certified applicators?

The correct choice is restricted-use pesticides, which are specifically categorized for purchase and application exclusively by certified applicators due to their potential to cause harm to humans, wildlife, and the environment if not used correctly. These pesticides require specialized knowledge of safety protocols, application techniques, and environmental considerations, which certified applicators obtain through training and certification programs.

General-use pesticides, in contrast, are available to the general public and pose a lower risk; therefore, anyone can purchase and apply them without any certification. Natural pesticides, while derived from natural sources, do not inherently require certification. Similarly, home-use pesticides can be utilized by homeowners and do not necessitate special qualifications. By restricting the use of certain pesticides to trained professionals, regulations ensure safer handling and application, mitigating risks associated with improper use.