Buzz into the Future: Conquer the Texas FFA Entomology CDE Practice Exam 2025!

The insect classified under Diptera that is known as a pest is the Deer Ked. Diptera, commonly known as true flies, includes insects that have a single pair of wings and are significant in various ecological and economic contexts. The Deer Ked, specifically, is a bloodsucking fly that targets deer and other mammals, potentially causing irritation, stress, and the spread of pathogens. Its pest status stems from its ability to impact wildlife health and, in some cases, livestock, making it a concern for those involved in agriculture and wildlife management.

In contrast, the other insects listed do not belong to the Diptera order or lack the pest characteristics associated with the Deer Ked. For instance, the Dobsonfly is part of the order Megaloptera and is typically more beneficial in the environment, focusing on aquatic systems. Dragonflies, classified under Odonata, are important predators of pests and do not exhibit the same pestilential behavior. Dung Beetles belong to the order Coleoptera and play a crucial role in decomposition and nutrient recycling, rather than being recognized as pests. Therefore, the Deer Ked stands out as the sole representative of the Diptera order in this context, making it the correct answer.