A: There is, but it’s not as easy as it was ten years ago. I know, that doesn’t sound right, but it’s true. We used to have an herbicide that would selectively kill dallisgrass in a Bermuda lawn, but it was pulled from the market because of environmental concerns around that time.
These days, you can still control dallisgrass, it’s just a bit more involved. Carefully spot spray dallisgrass in the lawn with a glyphosate like Killzall or Roundup. This will non-selectively kill anything you spray it on, so take care to just hit the weed and the smallest unavoidable amount of lawn next to it. The benefit of using Killzall is that glyphosates are not absorbed from the soil into the root system, and they quickly break down. The herbicide kills when sprayed on a plant’s green, growing leaves, but it doesn’t hang out and cause soil issues so that your lawn nearby can quickly regrow into the area. Make sure that glyphosate is the only active ingredient in the product you use; many such products put other herbicides in to work in concert for a faster burn, and that’s not what you want. Your lawn will have numerous small burned spots after such a treatment, but they’ll heal up quickly with regular watering, mowing, and fertilization.
Back up this individual spot treatment with regular applications of Dimension pre-emergent herbicide in late February, late May/early June, and September to prevent the vast majority of grassy weeds from sprouting in your lawn, and you can get and keep your dallisgrass problem under control.