Which of the following is an example of a biological control method in IPM?

Biological control methods in Integrated Pest Management (IPM) involve using living organisms to manage pest populations. This can include the introduction of natural predators or parasites that specifically target and help reduce the numbers of harmful pests. By utilizing these natural enemies, the pest population can be controlled in a way that is environmentally friendly and sustainable, allowing for a balance within the ecosystem.

For instance, releasing ladybugs into a garden can help control aphid populations since ladybugs feed on aphids. This method minimizes the need for chemical pesticides, supporting a healthier environment and promoting biodiversity.

The other options provided do not fit the criteria for biological control. Applying chemical pesticides, for example, relies on synthetic chemicals and does not involve living organisms to manage pests. Mechanical traps, while useful, only physically catch pests without utilizing any biological processes. Similarly, using synthetic herbicides is focused on chemically managing plants and does not contribute to the biological control methodology defined in IPM. Thus, introducing natural predators or parasites is indeed the quintessential example of a biological control method in IPM.