Which of the following practices could lead to resistance in pests?

Overapplication of the same pesticide is a significant factor contributing to the development of resistance in pests. When a specific pesticide is used repeatedly, pests that are susceptible to that chemical are killed, leaving behind those that have developed resistance. This selective pressure encourages the resistant pests to reproduce, leading to a population that is increasingly difficult to control with that same pesticide.

In contrast, practices like regular rotation of different crop types and integrating biological controls are beneficial strategies for managing pest populations and reducing the likelihood of resistance. Rotating crops can interrupt the life cycles of pests, and utilizing biological controls introduces natural enemies that can help keep pest populations in check. Classroom-based training for applicators enhances understanding of effective pest management strategies but does not directly influence pest resistance in the same way that pesticide application does.