If you’re a homeowner, you know how important it is to maintain a well-manicured lawn. But what do you do when unwanted weeds start to invade your property? One of the most problematic winter annual weeds in residential turfgrass is annual bluegrass.
What is Annual Bluegrass?
Annual bluegrass (Poa annua L.) is a weed easily recognizable for its light green color, coarser leaf texture, and unsightly seedheads. Both annual and perennial biotypes of this weed can be found in turfgrass. Perennial biotypes are more prevalent in areas that receive frequent irrigation and high nitrogen fertilization, whereas annual biotypes are more upright in growth and produce more seed.
Annual bluegrass seeds germinate in the fall and grow and mature, producing seeds in the spring. They can produce hundreds of viable seeds, even when the lawn is closely mowed. It grows well under cool conditions and can out-compete other turf species during late fall and early spring.
Controlling with Cultural Practices
Several cultural practices can help control annual bluegrass in your lawn. Deep and infrequent irrigation, reducing soil compaction, and reducing nitrogen fertilization during peak germination are all effective methods. Mowing height, frequency, and equipment also play a role in controlling this weed. Raising the mowing height during peak germination can encourage turf competition and reduce potential infestations.
Chemical Control
If cultural practices don’t work, you can use preemergence herbicides to control annual bluegrass. Herbicides should be applied in late summer or early fall before the weed starts to germinate. Several preemergence herbicides, such as bensulide, dithiopyr, pendimethalin, and prodiamine, are effective in controlling annual bluegrass. Always be sure to carefully read the label directions before using any herbicide.
In conclusion, annual bluegrass is a nuisance in residential turfgrass that can be effectively controlled with cultural practices and preemergence herbicides. Contact Alternative Environments for our weed control services if you need help controlling weeds in your lawn. Our team of experts will help keep your property looking its best all year round.
