Which type of pesticide can only be purchased and used by certified applicators?

Restricted-Use Pesticides can only be purchased and used by certified applicators because they pose a higher level of risk to human health and the environment due to their toxicity and potential for misuse. These pesticides are subject to more stringent regulations to ensure that they are applied safely and effectively, minimizing any hazards associated with their use.

Certified applicators have undergone specialized training that equips them with the knowledge to handle these substances responsibly. This includes understanding the proper application techniques, safety practices, and environmental considerations that are critical when dealing with more hazardous pesticides.

In contrast, General-Use Pesticides, Specialty Pesticides, and Household Pesticides are designed for wider accessibility and can be purchased and used by consumers without the need for certification, making them less restrictive and lower in toxicity in comparison to Restricted-Use Pesticides.