It is not uncommon for me to receive questions regarding whether it is OK to aerify an area when you’ve already applied a preemergence herbicide to control crabgrass. Will aerifying break the herbicide barrier and reduce my crabgrass control? The answer to this and more can be found here in a recent post I wrote at Turf Republic.
To Aerify or Not to Aerify when Using a Preemergence Herbicide
Aaron Patton, Turfgrass Extension Specialist