what is this weed? please help!! Quack grass or crab grass?
It is difficult to identify grass species from photos. This does not look like crabgrass or quackgrass. It looks like another type of grassy weed but we cannot say for sure what.
At this point handpull or dig with a weeding tool. You can spray with Roundup but control is difficult when weeds are mature. Follow label directions and reseed.