In terms of pesticide application, what does 'restricted use' indicate?

'Restricted use' in the context of pesticide application signifies that these substances can only be employed by licensed professionals. This designation is crucial for ensuring safe and effective use, as restricted use pesticides often contain ingredients or formulations that may pose significant risks to human health, beneficial organisms, or the environment if not applied correctly. Therefore, individuals applying these products must have specific training and credentials to understand their properties, potential hazards, and appropriate application techniques.

The other options do not accurately reflect the implications of 'restricted use.' For instance, while certain permits may be involved in the purchase process, the key component of restricted use is the requirement for professional licensing to ensure that the individuals applying these pesticides are adequately equipped to handle them responsibly.