Yes and no, depending on which product is applied. In the Indianapolis metro area and areas south applications should be made using the preemergence herbicide dithiopyr (Dimension). Dithiopyr will control crabgrass to one tiller.
Click HERE to learn more about these chemistries and track growing degree days. (Courtesy of Purdue Turf Tips) Bottom line, yes applications can still be made, just made sure the correct herbicide is used.
Go to j-dturf.com to learn more about J&D Turf.