Tim from Kaukauna, Wisconsin writes
Quackgrass, unfortunately, is so closely related to Kentucky Bluegrass that most products that will kill quackgrass will also severely damage, if not kill the KBG. The common recommendation is to kill the quackgrass with a glyphosate product like Roundup QuikPRO and then reseed with KBG. You might also check with a master gardener or local landscaping company in your area for their best recommendations on products that they have used successfully.
Answer last updated on: 08/20/2018
