Turfgrass Weed Control Database
It is difficult to achieve complete control of annual bluegrass with a single pre or post herbicide application. Preemergence and postemergence treatment may be needed. To achieve preemergence control with herbicides such as indaziflam (Specticle), prodiamine, (Barricade) pendimethalin (Pendulum) and dithiopyr (Dimension), apply on August 15 and water in immediately. Specticle can be applied later because it has postemergence activity on small annual bluegrass. In bermudagrass, one of the cheapest and easiest ways to control Poa annua is to use glyphosate while bermudagrass is completely dormant. Revolver (foramsulfuron), TranXit (rimsulfuron) and Monument (trilfoxysulfuron) will provide postemergence Poa annua control without damaging partially green bermudagrass or zoysiagrass. Simazine and atrazine are effective preemergence and postemergence on annual bluegrass that has not tillered.