they do take care of sod webworms
i forgot about nematodes. they will take care of sod webworms if the larvae is present. they need grubs, webworms, etc...to release their bacteria and then use the body to reproduce. my understanding is if the insects are not present the nematodes will die. i would say if the adults are zig zagging around lawns they are laying eggs right? so maybe wait two weeks and then apply nematodes?