I've been told that the two weeds that seem to be invading my lawn are
Orchard Grass and Dallisgrass. Apparently, these two aren't easy to
control and there isn't a selective herbicide that will kill them
without affecting the surrounding lawn (in my case, fescue). I'm near
Raleigh, NC.

Any ideas on how to deal with this problem? I do plan to overseed in
late September or early October...

Thanks,

-jav