Which herbicide group has experienced problems due to offtarget movement?

The herbicide group that has experienced issues related to offtarget movement is indeed the group that includes Banvel, MCPA, MCPP, and Turflon. These herbicides are known for their volatility and potential to drift from the target area, especially under windy conditions or when temperatures fluctuate. Offtarget movement can lead to unintended consequences, such as damage to non-target plants, crops, or natural areas, which has raised concerns among farmers, regulators, and environmentalists.

Understanding the behavior of these herbicides is crucial for effective application and minimizing environmental impact. The active ingredients within this group are systemic herbicides that can vaporize and be carried away by wind, making it important for applicators to follow best practices and use proper techniques to mitigate drift.

In contrast, the other herbicide groups listed do not share the same level of concern regarding offtarget movement. For instance, while they may have their own specific application challenges, they generally do not exhibit the same volatility or propensity to drift as the herbicides mentioned in the correct answer. This distinction supports the understanding of herbicide application safety and environmental stewardship among pesticide applicators.