Question: How can I eliminate dallisgrass from my lawn?

Answer: Dallisgrass forms dense, dark green clumps in all types of lawns. Each of its seeds is fertile, so it's very important that you remove the seed stalks as soon as they start to form. They develop really quickly, so that may mean mowing every 4 days during the summer.

You do have a couple of herbicide options. We'll state them a couple of different ways so there can be no confusion. Read carefully.

In bermuda: spray with MSMA in June or July. It will yellow your bermuda, but it will not kill it. Earlier treatments will not be effective. You need hot weather.

In other grasses, St. Augustine included: there is no herbicide that will kill dallisgrass without killing St. Augustine. Either hand-dig the dallisgrass clumps or spot treat them with a glyphosate herbicide. You may be able to apply the glyphosate in early spring, once the dallisgrass has greened up and started growing, but before the St. Augustine is green. Apply it only to the dallisgrass, as it will kill all other grasses. If you're careful in your application, the St. Augustine will fill quickly across it.