UACES Facebook Crabgrass


September 2012

QuestionFor years my wife's father had his yard in primo condition. Since his passing, the yard has cultivated a dandy crop of crab grass and other weeds unknown to me. I have used Ortho Weed Killer with crabgrass preventer, and it really doesn't seem to be doing the job. In thinking ahead to spring of 2013, what would be my best option in eradicating crabgrass from the yard, and should I start this fall? I do plan to apply a Wintertime weed and feed probably in mid October.

AnswerI don’t like to use any fertilizer on lawns in Arkansas after mid September unless you are growing tall fescue. Most southern lawns go dormant for the winter, and I would hate to encourage new growth, too late in the year, or spur on winter weeds. Crabgrass is a summer annual weed, which means it germinates in late spring, grows all summer, sets seeds and dies in the fall or early winter.  There is nothing to do this fall to prevent it for next year. Apply a pre-emergent herbicide in late February and a second application in early April and you should be good. Monitor for weeds during the growing season. The more dense the lawn grass, the less weeds you have. We do have lawn care calendars for each of the lawn grasses grown in Arkansas on our website.

Lawn Care Calendar: Bermudagrass

Lawn Care Calendar: Centipedegrass

Lawn Care Calendar: St. Augustinegrass

Lawn Care Calendar: Tall Fescue

Lawn Care Calendar: Zoysiagrass

 June 2012

QuestionWe used a pre-emergent herbicide on our lawn this year and it did not stop the progress of the weed called crabgrass. Is there something I can do to rid my yard of this grass?.

AnswerThe standard herbicide for crabgrass control for years was MSMA and it is no longer on the market. We now have products that contain quinclorac for control. However most homeowner products are combined with another herbicide –many have 2,4-D (a broadleaf weed killer) which could burn warm season grasses when applied during the hot summer months –trade names include Weed-B-Gone Max, Weed Stop plus Crabgrass Killer and All in One Lawn Weed and Crabgrass Killer. Some products are combined with sulfentrazone—a sedge killer; trade names include Image Kills Crabgrass or Sedge and Grass Killer. Make sure if you are applying herbicides that you read the label beforehand. Follow recommended rates and read if there are any temperature restrictions and that it is safe for the type of lawn you are growing. Many herbicides are not recommended for use on St. Augustine or Centipede lawns. Also, make sure that the lawn has ample moisture before applying chemicals or fertilizers or you could damage the lawn. Don’t spray on a windy day and don’t treat the entire yard if you just have a patch here and there—spot spraying would be much safer.

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