What does the LD50 of a pesticide indicate?

The LD50 of a pesticide refers to the "lethal dose for 50%" of a population, which is specifically the quantity of a substance needed to kill half of a specified population of test animals, typically measured in milligrams of pesticide per kilogram of body weight. This statistic is important because it provides a benchmark for understanding the toxicity of a pesticide. A lower LD50 value indicates a more toxic substance, as it requires a smaller amount to achieve lethal effects.

Understanding the LD50 helps in making informed decisions about pest control options, determining appropriate application rates, and assessing the relative risks associated with their use. The measurement is essential for regulatory purposes and is used to evaluate potential risks to humans, wildlife, and the environment from pesticide exposure.