Article from University of Nebraska - Lincoln
http://turf.unl.edu/turfinfo/5-18_Poa_triv.pdf
Bottom line - It is not easy.
Nonselective control
1. Rough bluegrass is most consistently controlled with glyphosate in spring. In research, I’ve consistently seen 69 to 99% control with spring applications. In contrast, midsummer applications provided 14 to 91% control, and late-summer applications were marginally more effective (42 to 94% control).
2. No matter when you treat, seed or sod to reduce the reestablishment of rough bluegrass, and the new establishment of other weeds.
3. It’s often necessary to use glyphosate in the same areas over multiple years to achieve control.
Controlling rough bluegrass (Poa trivialis) - UNL
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