Which signal word indicates the highest level of toxicity in pesticides?

The signal word that indicates the highest level of toxicity in pesticides is "Danger-poison." This term specifically signifies that a pesticide poses a significant risk to health or the environment and is highly toxic if inhaled, ingested, or absorbed through the skin. The use of "poison" in conjunction with "Danger" emphasizes the severity of the danger presented by the product.

In the context of pesticide labeling, "Danger" alone also indicates a high level of toxicity, but "Danger-poison" is reserved for the most hazardous materials, providing an additional warning about the extreme risks associated with its use. This labeling is crucial for ensuring that users handle the pesticide with the utmost caution and follow all safety precautions.

Other signal words like "Warning" and "Caution" indicate lower levels of toxicity and are used for products that, while still potentially harmful, do not present the same immediate or severe health risks as those categorized with "Danger-poison." This tiered system of labeling helps consumers and professionals appropriately assess and respond to the hazards presented by various pesticide products.