Biological control relies on the pest's natural enemies. Which of the following are examples of biological control?

Biological control is a pest management strategy that utilizes natural predators, parasites, and pathogens to reduce pest populations. The correct answer highlights that birds, insects, fungi, and viruses can serve as natural enemies of pests. For instance, birds might feed on insect pests, certain insects may act as predators of harmful pests, fungi can be used to infect and kill pest species, and viruses can target and infect specific pest populations. This method is considered environmentally friendly and sustainable since it harnesses the existing ecosystem dynamics, promoting a natural balance rather than relying on synthetic chemicals.

The other options include practices or products that do not align with the definition of biological control. Pesticides, insecticides, and fungicides are chemical treatments intended to manage pest populations; herbicides and nematicides are designed to control unwanted plants and nematodes, respectively, while traps and lures are physical methods to capture or monitor pests rather than utilizing their natural adversaries.