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Annual Bluegrass (Poa annua) Management in Lawns

Cameron Huntley - Wednesday, October 06, 2010
Annual bluegrass or Poa annua is a winter annual weed that invades many lawns such as Zoysia, Centipede, St. Augustine, Bermuda, and Fescue.  This annual weed generates from seed and is easily prevented by using a pre-emergent herbicide.  Fall is the best time to apply a pre-emergent herbicide to prevent annual bluegrass (Poa annua).  

Annual bluegrass (Poa annua) seeds lie dormant throughout the summer months and then germinate as soil temperatures begin to lower in the fall months.  Annual bluegrass (Poa annua) will mature throughout the winter and when spring arrives begins to grow more rapidly.  As warmer temperatures arrive during late spring and early summer, annual bluegrass (Poa annua)completes its life cycle and produces seeds that will drop  for the next crop in the fall.

Annual bluegrass (Poa annua)  is very unattractive in southern lawns and is hard to control once it matures in the spring.  Post-emergent selective herbicides are not nearly as effective as pre-emergent herbicides.  The best way to deal with this weed is through the use of pre-emergent herbicides such as Barricade.  Applications should be made in the fall prior to soil temperatures reaching 55º F.  In South Carolina lawns, this usually occurs between Sept. 15th and Oct. 15th.   Pre-emergent herbicides will also prevent other annual weeds from germinating such as chickweed, purple deadnettle, henbit, and others.  

Lawns that have suffered from annual bluegrass (Poa annua) in the past, are more susceptible to due to the amount of seed this weed produces.  Using Barricade pre-emergent herbicide can help prevent this weed before it becomes a nuisance in lawns.  Consult you local W.P. Law Inc. for more tips and advice on weed control for Zoysia, Centipede, St. Augustine, Fescue, and Bermuda lawns. 
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