Oregon Pesticide Practice Test

A pesticide with an LD50 of 0-50 mg/kg is labeled with which signal word?

1. Notice

2. Warning

3. Danger

4. Caution

The correct answer is: Danger

A pesticide with an LD50 (lethal dose for 50% of the population) of 0-50 mg/kg is considered extremely toxic. The signal word associated with such a high level of toxicity is "Danger." This designation indicates that the pesticide poses a significant hazard to health, and even a small amount can cause severe harm or fatality. The labeling system for pesticides uses these signal words to communicate the level of risk to users, and "Danger" signals the highest level of concern. Other labels, such as "Warning" or "Caution," indicate lesser degrees of toxicity, while "Notice" is not commonly used in this context. Therefore, a pesticide in the 0-50 mg/kg range clearly warrants the "Danger" signal word to ensure that users are fully aware of the serious risks involved.