Dallis grass question

[XLS]

Ok our regular treatment service for this junk is to kill off and reseed.
I am courious if we used pre-emergents in mid may would it help prevent new germination and slow the spread of this weed? I ask because I assume it will work just courious if any one does this or knows another way to treat this in lawns before they get took over?

[XLS]

Yeah that is how we do it on the regular week. I simply didn't know If the preem would stop the spread of the new seeds