What is the most likely health effect on a human or pet if bifenthrin is applied to a lawn?

• A. Nausea
• B. Hair loss
• C. Sneezing
• D. Itching and Rash

Answer: (D)

When someone or a pet comes into contact with lawn treated with bifenthrin, the most likely health effect is skin irritation—leading to itching and a rash. Bifenthrin is a pyrethroid insecticide, and residues on the grass can irritate skin on contact, especially for sensitive individuals or with repeated exposure. Other symptoms like nausea would generally come from ingestion instead of casual outdoor contact, hair loss is not a typical outcome of lawn exposure, and sneezing would reflect respiratory irritation rather than a direct skin reaction. So itching and rash best reflect the common, direct consequence of touching treated grass. To reduce risk, wash exposed skin after outdoor activity and follow the product’s label directions for use and drying times.