Which of the following is considered a natural control method for managing insect pests?

The option of releasing parasitic wasps is recognized as a natural control method for managing insect pests because it utilizes biological agents that target pest populations. Parasitic wasps lay their eggs in or on the bodies of certain pests, such as caterpillars or aphids, and the larvae that hatch feed on the host, effectively reducing the pest population.

This method promotes a sustainable approach to pest management as it harnesses the natural relationships within ecosystems, encouraging the protection of beneficial organisms while controlling harmful pests. In contrast, the other options involve synthetic or less environmentally integrated techniques, which can disrupt the ecosystem or may not align with natural pest control practices. For example, chemical insecticides can lead to resistance and harm non-target species, while insect repellents may deter a wide range of insects, often without specificity toward harmful pests. Employing insect traps can be useful but is generally considered a more mechanical approach rather than a natural biological one.