Which statement about pesticide toxicity is true?

The statement regarding pesticides with an oral LD50 of 5 mg/kg being more toxic than one with an LD50 of 250 mg/kg is accurate because the LD50 value measures the dose required to kill half of a test population and is expressed in milligrams of substance per kilogram of body weight. A lower LD50 value indicates that a smaller amount of the pesticide is needed to achieve lethal effects, thus demonstrating a higher level of toxicity. Therefore, a pesticide with an LD50 of 5 mg/kg is indeed considered more toxic than one with an LD50 of 250 mg/kg, as it requires much less of the chemical to produce harmful effects.

In this context, other statements may not hold true. For example, manufacturers are mandated to include warning statements about chronic toxicity on labels for many products, which underscores the importance of clear communication around potential risks. Additionally, the signal word on the label does not necessarily indicate chronic toxicity but is primarily focused on acute effects. Lastly, the notion that all pesticides carry the same level of toxicity regardless of formulation is not accurate, as formulations can result in varying toxicological profiles and environmental impacts.