Dallisgrass Control: How To Get Rid of Dallisgrass

Dallisgrass is a grassy weed that appears during the warmer parts of the year. The plant is named after Georgia farmer A.T. Dallis who was a big supporter of the plant and brought it onto his pastures in the late 1800s. Little did he know that his name would be attached to a hated invasive weed which drives landowners crazy due to how hard it is to control.

Dallisgrass is a troublesome perennial weed, meaning that it will come back from its roots year after year. Dallisgrass invades all types of turf grass: Bermuda, St. Augustine, zoysia, buffalograss. They are all unable to withstand its assault.

One of the big reasons Dallisgrass tends to thrive is soil compaction. If there is a lot of foot traffic, your desired grass could get beat down while Dallisgrass may thrive in the same conditions.

Dallisgrass control requires persistence or else this unsightly grassy weed will become the turfgrass of your nightmares. Our simple DIY Dallisgrass treatment guide will show you exactly how to remove this terrible weed from your lawn.

Follow the step-by-step instructions below using the recommended herbicides to the right and your lawn will be free of Dallisgrass in no time.

Identification

Before you can move forward with a treatment program, you need to properly identify Dallisgrass by knowing what it looks like. Misidentifying Dallisgrass can lead to you using the wrong herbicides, which can cost you time and money. Here are some traits to look out for when identifying Dallisgrass:

• Dallisgrass can be identified by its distinguishing clump which gradually grows in a circular fashion. Unlike most grasses which grow in clumps and bunches,
• Dallisgrass stands out due to their short rhizomes that increase the diameter of the plant and store carbohydrates.
• The way Dallisgrass grows makes controlling it frustratingly hard as the grass may avoid being chopped down by a lawnmower and they can be hard to pull out of the grass because of the thick and fibrous roots which can reach down to 1 meter deep in the soil.

• Dallisgrass is similar to crabgrass and each weed can easily be confused for one another. An easy way to know you have dallisgrass vs. crabgrass is to notice its growth pattern.
• Dallisgrass will typically grow taller and fuller where crabgrass grows outward (it will appear crab-like when looking at it straight down). In the picture above, dallisgrass is on the left and crabgrass is on the right.

Use the above description and images provided to help you identify dallisgrass on your lawn. If you are unsure whether the plant is dallisgrass or not, contact us with a photo of the plant and we will properly ID the weed for you as well as give you the proper product recommendations.

Inspection

After you have confirmed that the weed you are encountering is Dallisgrass, you can then move forward with inspection. During this phase, you will need to pinpoint the areas where Dallisgrass is concentrated and what the conditions of the area are. This will help you to determine where to focus your herbicide treatment.

Where to Inspect

Walk around your lawn and observe where dallisgrass is concentrated and determine how big of an infestation you have on your lawn. Dallisgrass grows especially around areas that are warm and moist during the summertime.

What To Look For

Search for outbreaks of Dallisgrass weed. The weed appears in star-like clumps with seed stalks that have three to five finger-like segments that are covered with fine, silken hairs.

Treatment

Please be sure that when handling any type of herbicide, you are properly protecting your skin and eyes with safety equipment (Goggles, gloves and long-sleeved clothing)

To get rid of Dallisgrass, chemical options are your best bet, especially if you have a large outbreak which will be time-consuming and take too much work to dig out. We recommend using a post-emergent herbicide like Celsius WG to kill and suppress Dallisgrass.

If your field or area suffering from heavy Dallisgrass, you will need a tandem attack of both pre-emergence and post-emergent herbicides. We recommend using a pre-emergent herbicide in early spring to kill seedling weeds and then follow up with post-emergence herbicide treatment of Celsius WG.

If you are a licensed professional applicator that is treating a commercial property or agricultural setting, check out MSMA Target 6 Herbicide which is our go-to option for non-residential areas.

Step 1: Mix and Apply Celsius WG

Celsius WG is a post-emergent herbicide that comes in the form of water-dispersible granules and is an excellent dallisgrass killer. Celsius WG is also great to use on St. Augustine grass, Bermudagrass and other labeled warm-season grasses to control perennial and broadleaf weeds.

Before mixing Celsius WG into your sprayer, determine how much Celsius WG you need by calculating the square footage of your target are. To do this you will need to measure and multiply the area length times the width (length x width = square footage).

For spot treatments, you can treat 1,000 sq. ft. by using a rate of 0.113 oz. (3.2 g) of Celsius WG in 1 gallon of water. For Dallisgrass, two spot treatment applications are recommended to achieve the best possible results in controlling the weed.

A good tool to use to aid with your herbicide application is mixing your selected herbicide with a surfactant like Nanotek Surfactant so that your application can stick to the Dallisgrass and not runoff. Mix the Celsius WG with water first and once it is well mixed, add the surfactant at per finished gallon.

Once the product is well-mixed in your sprayer, apply the product to the Dallisgrass using a fan nozzle setting to get a nice even coating.

Because of the weeds persistence, a repeated application may be necessary about 2 to 4 weeks later. Repeat treatment in intervals until the Dallisgrass has died out.

Prevention

Dallisgrass is a perennial plant so there is little that can be done to completely and totally prevent the grass from coming back. However, what helps your chances of keeping Dallisgrass away is by making sure your yard is healthy and densely planted with turf. Mow your lawn at higher heights of 3 to 4 inches to help your turf better resist a reinvasion of Dallisgrass. For problems in ornamental beds, adding mulch can help Dallisgrass seedlings not reestablish.

Dallisgrass is known to be persistent and will grow on bare areas if not managed right away. A late winter to early Spring Pre-Emergent like Dithiopyr 40WSB is a solid way to stop this invasive grassy weed from returning and spreading.

Dithiopyr 40WSB contains Dithiopyr, a highly effective active ingredient that controls and prevents seeds from sprouting. Dithiopyr is meant for larger pieces of land since it comes in premeasured packets where 1 packet treats roughly 10,890 sq. ft. Measure the square footage of your lawn to determine how much Dithiopyr you will need.

Once you have measured the appropriate amount based on your calculations, add the Dithiopyr 40WSB to an appropriately calibrated sprayer and then apply the Dithiopyr until your lawn is covered evenly to get a uniform application. Once applied, activate the granular product with an 1/2 inch of water.

Key Takeaways

What is Dallisgrass?

• Dallisgrass is a perennial grassy weed that forms large clumps and can spread over an entire lawn in rapid fashion.

How To Get Rid of Dallisgrass

• We recommend using Celsius WG to kill Dallisgrass. Professional applicators should use MSMA Target 6 Herbicide.

Preventing Dallisgrass Reinfestation

• Preventative measures for Dallisgrass include applying Dithiopyr 40WSB in the early spring to stop weed seeds from growing and ensuring your yard has a dense, thick stand of grass that will choke out any opportunity for Dallisgrass to re-establish.