Which of the following is an effective way to manage pesticide resistance?

Rotating pesticide classes is an effective way to manage pesticide resistance because it helps to reduce the selection pressure on pest populations. When the same pesticide or class of pesticides is used repeatedly, pests can develop resistance over time through natural selection. By alternating different classes of pesticides, each with distinct modes of action, the likelihood of pests developing resistance is diminished. This practice allows for the continued effectiveness of pesticides as it targets varied biological mechanisms in pests, thereby prolonging the efficacy of pest control methods.

The other strategies listed, such as increasing application frequency or using higher dosages, can exacerbate resistance issues by applying higher levels of selection pressure on pests. Limiting pesticide use can be beneficial in a broader integrated pest management strategy, but if not combined with effective resistance management practices like rotation, it might not directly address the resistance problem.