Is low toxicity indicated by a low LD50?

The correct choice is that low toxicity is not indicated by a low LD50. The LD50, or lethal dose for 50% of the test population, is a crucial measure in toxicology that indicates the toxicity of a substance. A low LD50 value signifies that a chemical is toxic and requires only a small amount to cause harm or death to 50% of the test subjects. Therefore, a lower LD50 corresponds to higher toxicity.

This understanding is essential for pesticide applicators, as it informs safety practices and the potential risk of using certain pesticides. Applicators must take precautions based on the toxicity level indicated by the LD50 measurement. In contrast, a high LD50 value suggests that more of the substance would be needed to reach a lethal effect, indicating lower toxicity.

In conclusion, the relationship between LD50 and toxicity is fundamental in assessing the safety of pesticides, and recognizing that a low LD50 corresponds to high toxicity is critical for responsible handling and application practices.