Which types of plants are more likely to be attacked by borers?

Unhealthy plants are indeed more susceptible to borer attacks due to their weakened state. Borers, such as the larvae of various beetles and moths, target plants that are not thriving because these plants often have reduced defenses against pests. Stress factors—such as poor soil conditions, disease, or physical damage—can decrease a plant's ability to resist such infestations.

Healthy plants, on the other hand, typically have robust defenses and vigor that make them less attractive to borers. While flowering or fruit-bearing plants may also face attacks, their health status is far more determinative. Healthy plants can develop mechanisms to prevent or diminish insect damage, whereas unhealthy plants lack these protective qualities, making them prime targets for borers. Therefore, the correct answer is that unhealthy plants are more likely to be attacked by borers due to their weakened defenses and overall vitality.