Pesticide mobility is determined by:

• A. The weather only
• B. The nature of the pesticide
• C. The crop type only
• D. The application method only

Answer: (B)

Pesticide mobility is governed by the chemical’s own properties—the nature of the pesticide. How it moves depends on intrinsic factors like water solubility, volatility, and how strongly it binds to soil (adsorption). A highly water-soluble chemical that doesn’t bind tightly to soil can leach through the soil with infiltrating water, potentially reaching groundwater. A pesticide with high volatility can move through the air as vapor, increasing drift and off-target movement. If a compound binds tightly to organic matter or minerals, its movement is limited and it stays nearer to the application site. Degradation rate and persistence also affect how long a pesticide remains capable of moving. Weather, crop type, and application method matter for real-world outcomes, but the fundamental determinant of mobility is the pesticide’s inherent properties.