What is a typical symptom of corn earworm infestations on grain sorghum?

The symptom of improperly filled corn heads is particularly relevant when discussing corn earworm infestations on grain sorghum. Corn earworms primarily feed on the reproductive parts of the plant, including developing ears and seeds. In the case of grain sorghum, an infestation can lead to reduced seed development and empty or improperly filled heads due to the larvae feeding on the kernels. This feeding disrupts normal growth and leads to lower yields, which is a significant concern for grain producers.

In contrast, other symptoms like yellowing of leaves, wilting of the plant, and stunted growth of seedlings are typically associated with other stressors or diseases rather than a straightforward corn earworm infestation. Yellowing leaves can indicate nutrient deficiencies or other stress factors, while wilting often suggests overwatering, underwatering, or drooping caused by disease rather than direct pest damage. Stunted growth of seedlings may occur due to competition or root problems, which are not the main effects of corn earworm activity.