I have never heard of anyone having success with simple sprays for dallis grass. What kind of grass do you have? Most will creep to refill but fescue must be reseeded.

I feel your pain and dallisgrass is one tough Mother to control. Since you are in OK I assume you have Bermuda grass?

Persistence is required to control it with cultural practices. Clumps can be dug out. Mowing the lawn will not get rid of dallisgrass, but when the lawn is mowed at its optimum height, it is better able to resist an invasion of dallisgrass. Also, close mowing decreases shoot vigor and results in lower seed production. So if you have Bermuda keep it very short.

When dallisgrass is established in the lawn, seeds will be abundant in the soil. However if the lawn is well established the seedlings will not be able establish themselves, but any open areas of the turf will be invaded.

Removing young plants by digging them out before they form rhizomes or set seed is the best strategy for control. Mature plants can also be dug out, but they sometimes grow back if rhizomes are left behind.

When digging clumps is not practical, herbicides can be used. MSMA or
CMA can be used to control clumps of dallisgrass. They must be applied two to three times at 3-week intervals in the summer. The grass and dallisgrass should be in good growing condition before application. Also, it is best if the dalliesgrass is left unmowed for a period of time before the first application to get the maximum amount of leaf area to spray the herbicide onto. Do not water for 24 hours after application.

You can also use Round Up, but it will kill the surrounding grass. If you have Bermuda, not to worry, once the plant is dead, get some sand, loosen up the soil and mix in the sand, and the surrounding Bermuda will fill it in quickly.

The other thing you can do is proper use of pre-emergence herbicide. Use a good one like Dimension or Amaze year round, or at least two applications in early spring, and another application 6 weeks later to prevent seed germination. But this only applies if you have Bermuda and do not have or need to over seed.

I have spent the last few weeks with a weed hound zapping up dallis grass by the 5 gallon bucketfull. It does not respond to sprays. Mow low a couple of times, and the get to work. I have filled over 25 5 gal buckets, and the yard is really starting to look good. I have pulled so many weeds that my yard has essentially been "aerated." A couple of tips - make sure the lawn is a little moist, and don't try to get it all at once.

I think I have dallis grass but could be tall fescus. Any idea how to tell them apart?
Anyone have luck with a product called Fert.lome? This product supposedly kills crab, nutgrass, and dallis grass among others.
The thick mounds are rapidly spreading. I sprayed them today but the neighbor is doing nothing.
I can't remember a year where all these weeds like Spreading Charlie and Dallis grass is so troublesom.
Any advice would be welcom.
Thanks,
Julyguy

I have this problem also and would love any tips others might have.

Here is a link that might be useful: Texas Gardening Forum

This question for so long. But I think this post will be helping others