Some infected plants may survive but they are stunted. The second phase is foliar blight. Economically, the foliar blight phase is not as damaging as the seedling phase. It is rare that infections beyond the seedling stage develop systemically and cause plants to wilt. After the seedling stage, foliar blight symptoms are typical.
Lesions start from flea beetle feeding scars.
These lesions extend along the veins as gray or yellow streaks. If the corn is susceptible, infected leaves may eventually die. For field corn, I am not aware of any literature that addresses foliar blight damage by this disease, probably because it rarely causes damage in field corn. Defoliation by Stewart's disease, however, can weaken plants and increase the likelihood of stalk rot. In inbred lines and sweet corn, foliar blight can cause significant yield losses.