So why would we take the risk of using glyphosate in an attempt to control poa? There are two reasons. First, the cost of light glyphosate treatment is next to nothing so it would be a huge cost improvement over the alternative we will discuss later. Also poa has a tremendous diversity in its population so strictly using one control strategy tends to fail over time as resistant strains of poa can by selected. By employing different strategies better overall control should be achieved which is Weed Resistance 101.
The picture below illustrates our preferred poa control strategy (although not our exclusive one). The white splotches below are poa annua plants that are succumbing to our Prograss applications from last fall. Pretty effective but the cost is nearly $450/acre so finding a cheaper alternative would be beneficial.
Now you know why we have some odd looking strips scattered in fairways. These are our test plots to evaluate poa control strategies. Hopefully you see why we experimented last fall and although the strip on 17 fairway may not have worked as we hoped, we learned something in the process and might be able to dial in an effective rate for poa control in the future.