Quack grass

[Hopalong]

Yes mallee, same as couch grass.
Before Roundup, thousands of tons of cultivator shovels were worn out each year trying to control it.

[rook]

Glyphosate is affordable so it's worth a try.

[Jay-mo]

1 liter sprayed in fall is worth 2 liters sprayed in the spring. Do it.

[WiltonRanch]

quack is nasty stuff. Guys fallowing that did a good job would work the patches separate and clean the cultivator before doing the rest of the field. I don't know what's worse though quack or green foxtail. I had a flooded out spot which I seeded down to grass but it flooded and left me with green foxtail. It dried back to normal so I sprayed it out with 720gr/ac in early August. The moon must have been right. Got a good kill but so other grass fields I sprayed took more time to die. There is something to that moon cycle.