There is a lot of late planted corn going on and temperatures have been warm enough to bring out the insects. It may be worth mentioning stink bugs since they have become more problematic in seedling corn in recent years. Brown stink bugs are the most commonly found stink bug on early season corn. Stink bugs feed on plant fluids using their piercing-sucking mouth parts which leaves holes in the leaves, that become enlarged and irregularly shaped as the leave unfolds. This feeding will cause the “halo effect” where the holes appear to be outlined in a white to yellow color. Stink bugs feeding on corn can also kill small seedlings because they kill the growing point of the plant; surviving plants usually have stunted growth, and reduced root masses, all of which can cause yield losses.
Stink bugs hibernate as adults in leaf litter. If they see a young corn crop as they are leaving their hibernation spot, they often will grab a meal to have the energy to move to other hosts. The also are more likely to be found in the morning on young plants near the ground. Thresholds have not been well established inMissouri, but 2-3% of damage may justify an application
Check out photos of damage and what Dr. Angus Catchot had to say about stink bugs in Mississippi corn.