I've used Talstar P for years under slabs (new construction) for termite prevention. Decided to use it in my yard many years ago. No bugs for 2 years. No mosquitoes for longer.
The following year my lawn looked the best it's ever looked.
I've found it's best to mow, remove thatch, spray the entire lawn, & apply in the evening, or late in the day. Army worms are most active at night. Good luck.