Management and Maintenance
Annual bluegrass (Poa annua) infestations are a common problem in bermudagrass (Cynodon spp) turf. In Tennessee, bermudagrass growth slows during the fall as temperatures cool, and the species eventually enters winter dormancy. Dormant bermudagrass turf is often overseeded with cool-season turfgrasses, like perennial ryegrass (Lolium perenne), to provide green color throughout the winter months. While overseeding provides competition against various winter annual weed species, certain herbicidal measures must be taken to provide complete control of annual bluegrass in overseeded bermudagrass turf.
"W204-Annual Bluegrass (Poa annua) Control in Overseeded Bermudagrass Turf," The University of Tennessee Agricultural Extension Service, W204-11/08 09-0119, http://trace.tennessee.edu/utk_agexturf/3