A pesticide having an LD50 of 80 is ______________than a pesticide having an LD50 of 160.

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Prepare for the Iowa DOA CORE Pesticide Applicator's License Test. Study with flashcards, multiple choice questions, and detailed explanations. Get ready for your exam!

Multiple Choice

A pesticide having an LD50 of 80 is ______________than a pesticide having an LD50 of 160.

Explanation:
Lower LD50 numbers mean greater acute toxicity. LD50 is the amount of chemical required to kill 50% of the test population and is usually expressed as milligrams of chemical per kilogram of body weight. If a pesticide has an LD50 of 80, it takes a smaller dose to reach that lethal effect than a pesticide with an LD50 of 160. Therefore, the one with 80 is more toxic. This reflects potency, not necessarily how concentrated the product is in a spray; formulation, absorption, and other factors influence how toxicity translates to real-world exposure.

Lower LD50 numbers mean greater acute toxicity. LD50 is the amount of chemical required to kill 50% of the test population and is usually expressed as milligrams of chemical per kilogram of body weight. If a pesticide has an LD50 of 80, it takes a smaller dose to reach that lethal effect than a pesticide with an LD50 of 160. Therefore, the one with 80 is more toxic. This reflects potency, not necessarily how concentrated the product is in a spray; formulation, absorption, and other factors influence how toxicity translates to real-world exposure.

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