Which important warning must appear on all pesticide product containers?

The important warning that must appear on all pesticide product containers is "Keep Out Of Reach of Children." This requirement is crucial for public safety, as children are often curious and can easily access substances that are harmful to their health. Pesticides contain chemicals that can pose serious health risks if ingested, inhaled, or absorbed through the skin by young children. By mandating that this warning appear on pesticide containers, regulatory bodies aim to prevent accidental poisonings and ensure that guardians take necessary precautions to keep harmful substances inaccessible to children.

The other options, while they address important safety considerations, do not have the same universal requirement across all pesticide products. For instance, advising to "Use Just A Small Amount" may apply to specific pesticides but is not a standard warning for all. "For Professional Use Only" pertains to certain formulations that are not intended for consumer use and therefore isn't a general warning. Similarly, "Wear Gloves When Applying" is a guideline for safety during application but does not apply to all pesticides and is not mandated on every container.