What biological control methods can be employed for wood-destroying pests?

Introducing natural predators or parasitoids is a well-established biological control method for managing wood-destroying pests. This approach leverages the natural ecological relationships between organisms to reduce pest populations. By bringing in predators or parasitoids that specifically target wood-destroying pests, their numbers can be effectively controlled without the use of chemicals, which may have adverse environmental effects.

Natural predators can consume pests directly, while parasitoids lay their eggs on or inside the hosts, leading to the eventual death of the pest. This method is sustainable and can create a more balanced ecosystem, diminishing the need for chemical interventions while reducing the likelihood of pest resurgence.

The other choices represent different pest management strategies. Chemical repellents, for instance, provide a temporary deterrent rather than a long-term solution, and they may not effectively reduce existing populations. Thermal treatments can also manage pests but do not involve biological control. Enhancing humidity levels may impact certain insect pests but generally does not serve as a targeted biological control approach. Thus, introducing natural predators or parasitoids stands out as the most effective and sustainable option within the context of biological control methods.