How can you prevent soil herbicides from moving off target?

How can you prevent soil herbicides from moving off target?

• A. Do not apply herbicides to areas where they may leach into groundwater, or run off into water sources or cropping areas. Also avoid applying herbicides to areas where desired tree and shrub roots may extend and DO NOT apply herbicides to frozen soils.
• B. Apply herbicides to areas near streams to maximize uptake.
• C. Use higher rates near streams.
• D. Apply only during rainfall.

Answer: (A)

Preventing off-target movement of soil herbicides comes down to choosing application sites and conditions that minimize leaching, runoff, and uptake by non-target plants. If the product could reach groundwater, streams, or nearby crops, it may move away from the intended area, causing damage and contamination. Avoid applying where desired trees or shrubs have roots that extend into the treatment zone to prevent unintended uptake or root-to-root movement. Also, applying to frozen soils is risky because the thawing process can push or concentrate the herbicide in ways that move it beyond where you want it.

Choices that place the herbicide near streams, use higher rates in sensitive zones, or require rainfall create conditions that promote movement and increase the risk of off-target effects.