Which of the following insects is commonly used as a beneficial insect in greenhouse pest management?

Ladybugs, also known as ladybird beetles, are commonly used as beneficial insects in greenhouse pest management due to their voracious appetite for aphids, spider mites, and other soft-bodied insect pests. By introducing ladybugs into a greenhouse environment, growers can effectively reduce pest populations without the need for chemical pesticides.

In addition to their pest control capabilities, ladybugs also reproduce quickly, which helps maintain their population in greenhouses, providing ongoing protection against crop-damaging pests. Their presence can lead to healthier plants and a more balanced ecosystem within the greenhouse.

Other choices, such as termites, ants, and moths, do not serve the same beneficial purpose. Termites are destructive to plants and structures, while some ants can protect pests like aphids in exchange for honeydew, which benefits the pests instead of the crops. Moths, depending on the species, can often be pests themselves, laying eggs on plants and causing damage as their larvae feed on vegetation.