Post-emergent control of Poa annua

As the fight against poa invasion of bentgrass greens continues, many superintendents are taking another look at Velocity (bispyribac). Although this product is not labeled for use on greens, and although it can cause thinning and yellowing of bentgrass if rates and timings aren't calibrated precisely, some turf managers are reporting success with this herbicide.

In the table below, we compare three products (including Velocity) with post–emergent control activity against poa. None of them, of course, is a magic bullet;…