Damage caused by fall armyworms often appears browned or burned patches resembling drought stress. If you have distressed patched of grass in your lawn, be sure to go take a closer look.
While armyworm damage may seem to appear overnight, it is likely the larvae have been feeding for a week or more before noticeable damage appears. Newly installed sod is highly attractive to fall armyworms because it is well fertilized and well watered, and therefore is more susceptible to damage.
Damage to established grass is mostly aesthetic, but newly sodded areas can be severely damaged or even killed by armyworm feeding. If armyworms are identified and controlled early, grass recovery is expected without the need to replace the sod.