How can heavy infestations of sorghum webworms be identified?

Heavy infestations of sorghum webworms can be identified primarily by the presence of white fecal pellets. These pellets are characteristic evidence of webworm activity as the larvae feed on the plant. When sorghum webworms infest a crop, they consume leaf tissue, which results in visible damage as they create webs and deposit fecal matter. The white color of the fecal pellets contrasts against the green foliage, making them a reliable indicator of infestation.

While hollowed-out kernels, wilting leaves, and missing plants might indicate other types of damage or stress to the plant, they are not specific signs of sorghum webworm activity. Hollowed-out kernels could suggest other insect pests or diseases affecting the grain; wilting leaves can result from environmental stress, such as drought or disease; and missing plants could be due to various factors, including herbicide damage or other pest pressures. Therefore, the presence of white fecal pellets serves as a clear and distinct sign of sorghum webworm presence specifically.