Poa annua seed head suppression

In mid march we sprayed our fairways with a product called embark. Embark stops the poa from forming a seed head. I have sprayed this product for years and have had great results. It allows us to reduce our fairway mowing from 3 days a week, to 2 days a week, a substantial savings in fuel, labor, and wear on the machines. Below is a pic of where the boom was turned off too soon and you can see where the seed heads have appeared next to where the fairway has been sprayed.