Quack grass poisons the maize amid which it often grows, in order to inhibit its growth.
From the economist.com
The same is true for perennial grassy weeds such as quack grass.
From the jsonline.com
I had a similar challenge many years ago with quack grass in an area where herbicides were not an option.
From the stltoday.com
Panicum repens is a species of grass known by many common names, including torpedograss, creeping panic, panic rampant, couch panicum, wainaku grass, quack grass, dog-tooth grass, and bullet grass.