Agronomy Degree Practice Exam

What is the most common beneficial insect species associated with crop production?

1. Lady beetle

2. Parasitic wasp

3. Praying mantis

4. Walking sticks

The correct answer is: Lady beetle

The lady beetle, commonly known as the ladybug, is the most prevalent beneficial insect associated with crop production due to its role as a natural pest control agent. These insects are particularly effective at managing aphid populations, which are notorious pests that can damage a variety of crops. The larvae of lady beetles are also voracious predators of aphids and other soft-bodied insects, contributing to their effectiveness in controlling pest populations. In addition to their predation on pests, lady beetles have a short life cycle and multiple generations per season, allowing them to quickly establish their presence in agricultural systems and provide ongoing control of pests. Their beneficial impacts not only help to protect the crops but can also reduce the need for chemical pesticides, promoting more sustainable farming practices. While the other options also include beneficial insects, their roles or prevalence may vary. Parasitic wasps are indeed effective in controlling certain pests, such as caterpillars and aphids, but their presence is more specific to particular situations. Praying mantises are generalist predators but are less commonly found in large numbers compared to lady beetles. Walking sticks, in contrast, are not typically associated with crop production and do not provide pest control services. Thus, the lady beetle stands out