My lawn is getting overrun with quack grass. Seems it is at epidemic proportions in my neighborhood as well. Trying to use vinegar and soap mixture to kill it. Works but there is so much it is out of hand now. Neighbor was told that Halt by a Scotts representative he met at the store said Halts could be used in the fall to remove it. I called Scotts and they had nothing in their data supporting this method. Please help us before it is too late.
Livingston County Michigan
Hmmm.... Halts is a preemergent to prevent germination of CRABgrass in the spring. It will have no affect on quackgrass any time of the year.
Quackgrass (Elymus repens) is a cool season perennial grass that spreads primarily by rhizomes. Control will be difficult. Probably the most effective control will be applying a non-selective herbicide like glyphosate starting in the spring to kill everything (multiple applications) and then reseeding by early September.
https://plantscience.psu.edu/research/centers/turf/extension/plant-id/grasses/quackgrass <= check out the video in quackgrass identification
https://fyi.extension.wisc.edu/mastergardener/files/2016/01/Crabgrass-vs-Quackgrass.pdf <= quackgrass vs. crabgrass info