Try Roundup or Finale. Either will do a good job this time of year.
Crabgrass herbicides such as MSMA do not work well this time of year. They
work much better when crabgrass is very young. Another note, there are many
other types of grassy weeds that people call crabgrass but may note be.
Some are perennial, such as dalisgrass, so a nonselective like Roundup is
probably your best bet. Do not be disturbed when you see some crabgrass
coming up after killing and aerating or whatever prep method you use.
Crabgrass, and others, will continue to germinate up to frost.

--
Baine


"bestokes" wrote in message
. com...
How do you kill it? I've seen Crab Grass prevention but that doesn't help
me now.
Thanks
Brad