Data wrote in
oups.com:

If there is not toooooo much of it about, a neat little trick is to
bunch up the weed gradd into a tube - dpending upon the size of the
clump, then spray Roundup (Glyphosate) down the tube onto the weed
grass. Sure. a little will probably find its way onto surrounding
grasses, but nothing that some overseeding can't sort out. Otherwise,
just bunch it up and cut it down into the guts of the root system.
You may then find that it is not quite the massive job to dig out the
root.

Another technique:
For isolated weeds, put on a surgical glove, then a disposible cotton
glove over that. Wet the cotton glove with the chemical, and carefully
wipe your hand over the weed. You have lots of control this way.

For widespread weeds, wrap a flat-ended rake with old cloth, dip the cloth
in the chemical, and carefully rub it over the weeds. This only works if
you let the weeds get taller that the surrounding plants. It will also
require multiple applications, because you aren't getting the chemical
over the whole plant.