If round exit holes are found in the kernels of dried ornamental corn on the cob, which pest is the most likely culprit?

The presence of round exit holes in the kernels of dried ornamental corn on the cob is indicative of the Angoumois grain moth. This pest specifically targets grains and seeds, and its larvae live within the kernels as they feed, eventually creating round exit holes when they emerge as adults. The round shape of these exit holes is a distinguishing characteristic that aligns with the behavior of the Angoumois grain moth, as it bores directly into the grains, unlike other pests that may leave different types of damage or holes.

In contrast, other pests like the granary weevil tend to create more oval-shaped holes and are known for their different feeding practices, which do not involve burrowing out of the kernels in the same way. The lesser grain borer causes damage that can also be identified by holes, but their exit holes are more irregular and are primarily associated with different grains. The pea weevil, on the other hand, typically affects peas and legumes, making it less relevant to the situation described involving ornamental corn. Therefore, the Angoumois grain moth is the most likely culprit due to its specific interaction with corn kernels and the distinct nature of the exit holes it creates.