Which pest is specifically harmful to corn vegetation?

The armyworm is specifically harmful to corn vegetation due to its feeding habits. Armyworms are known to consume the leaves of corn plants, which can lead to significant damage and reduce the overall yield. They are particularly aggressive in their feeding during their larval stages, and a high population can decimate crops within a short time frame. Managing armyworm populations is crucial for corn farmers to maintain healthy crops and prevent substantial economic losses.

In contrast, the green peach aphid primarily affects peach and other related plants rather than corn. Yellow scale and California red scale are types of scale insects that typically target woody plants, shrubs, and other crops not specific to corn. Thus, while these other pests can be damaging to certain plants, the armyworm's specific affinity for corn makes it the most relevant pest in this context.