Which of the following is NOT a common pathway for off-site movement of pesticides?

Which of the following is NOT a common pathway for off-site movement of pesticides?

• A. Air currents
• B. Rain
• C. Leaching through soil to groundwater
• D. Increased soil pH

Answer: (D)

Off-site movement happens through physical transport pathways. Pesticides can move through the air by volatilization and spray drift, be carried away by rain through wash-off or surface runoff, and move downward with water through the soil to groundwater (leaching). Increased soil pH is not a transport pathway by itself; while pH can influence a chemical’s solubility and how it sorbs to soil, it does not describing a mechanism that transports pesticides off the treated area.

Off-site movement happens through physical transport pathways. Pesticides can move through the air by volatilization and spray drift, be carried away by rain through wash-off or surface runoff, and move downward with water through the soil to groundwater (leaching). Increased soil pH is not a transport pathway by itself; while pH can influence a chemical’s solubility and how it sorbs to soil, it does not describing a mechanism that transports pesticides off the treated area.