Which attribute is true of the long horned borer?

The attribute that states the long horned borer primarily attacks diseased trees is accurate because these pests are often drawn to weakened or stressed trees that are more susceptible to infestation. Healthy trees usually have the vigor to fend off such attacks, while those that are already compromised provide easier opportunities for the larvae to enter and exploit the tree's resources. Understanding the specific behaviors and habits of pest species is crucial, as it helps in developing effective management strategies.

The other options present misconceptions about the long horned borer's behavior. The notion that it reinfests structures frequently suggests a high likelihood of recurring infestations, which is less relevant for this type of pest that targets specific hosts. The claim that it infests only softwoods is misleading since different species can attack both hardwoods and softwoods, depending on the surroundings and species of the borer in question. The assertion that long horned borers create holes in metal is inaccurate since their feeding habits and activities are related to wood and plant material, not metal structures.