What is a key precautionary statement that all pesticide labels must carry?

A key precautionary statement that all pesticide labels must carry is "Keep out of reach of children." This statement is vital for ensuring the safety of children, who may inadvertently come into contact with harmful substances. Pesticides can be toxic if ingested, inhaled, or absorbed through the skin, and children are particularly vulnerable due to their size and developmental stage. By including this statement, manufacturers and regulatory agencies emphasize the importance of safe storage practices to prevent accidental poisoning.

The other options, while they may promote safety, are not uniformly required on pesticide labels. For example, the suggestion to "Use during daylight only" is not a universal precaution applicable to all pesticides, as some may be effective or designed for use at any time. Similarly, "Dispose of after one use" does not apply to all products, as many pesticides are intended for multiple applications or have specific disposal instructions that do not necessitate disposal after a single use. The statement regarding storage only indoors is also not a standard precaution for all pesticides, as storage conditions may vary based on the product formulation and environmental factors. Thus, the requirement for all labels to include the precaution to keep out of reach of children stands out as a fundamental safety measure.