How to Use Spectracide Weed Stop for Lawns for St. Augustine and Centipede

When it comes to weed control in home lawns, St. Augustine and centipedegrass are sensitive to common herbicide active ingredients like 2,4-D, dicamba, MCPP and MSMA. Those ingredients can sound like a mouthful to some of us who don’t normally deal with herbicide chemicals everyday. Sod University covers an easy-to-use product created by Spectracide that easily hooks up to the end of your garden hose and is safe to use on St. Augustine and centipede lawns. With the active ingredient Atrazine, Spectracide Weed Stop For Lawns For St. Augustine and Centipede selectively kills off weeds without damaging your lawn.
Spectracide Weed Stop For Lawns For St. Augustine and Centipede Product Overview
Like most hose-end Spectracide products, Spectracide Weed Stop For Lawns For St. Augustine and Centipede is convenient and easy to use. This herbicide hooks up to the end of your garden hose for an even spray application—no tank mixing or granular spreader required. As a pre-emergent and post-emergent, this herbicide prevents labeled weeds from appearing before they germinate and controls currently invading weeds as well. With the active ingredient Atrazine, Spectracide Weed Stop For Lawns For St. Augustine and Centipede selectively kills off tough weeds without damaging your lawn.
Weeds Controlled with Spectracide Weed Stop For Lawns For St. Augustine and Centipede
Some of the weeds this product offers control over include dollarweed, Florida betony, sandspur, Poa annua, common chickweed, crabgrass, cranesbill, cudweed, dichondra, henbit, knotweed, lespedeza, moneywort, mustards, narrowleaf vetch, parsley-piert, pennywort, smutgrass, spurge, spurweed, swinecrest, woodsorrel and various annual clovers.






Pictured above from left to right: Dollarweed, Poa annua, common chickweed, crabgrass, henbit and spurge.
For more information about identifying weeds, read our Identifying Common Lawn Weeds article.
How to Use Spectracide Weed Stop For Lawns For St. Augustine and Centipede
Spectracide Weed Stop For Lawns For St. Augustine and Centipede selectively kills weeds without damaging your St. Augustine or centipede lawn. This herbicide is considered a “hose-in variety”, meaning that your standard garden hose nozzle easily connects for application. For each 32 oz. bottle, you’ll be able to cover approximately 3,720 sq. ft. so shop according to the size of your lawn. This product works best when applied in 45–90 degree Fahrenheit weather. If weather conditions are extreme or if there is heavy rain forecasted, wait for a better day.
Here are the simple instructions for Spectracide Weed Stop For Lawns For St. Augustine and Centipede applications:
- Shake the bottle well and connect the hose to the sprayer nozzle, taking special care to ensure that the switch is fully forward in the “off” position.
- Move to the farthest area of the lawn before turning the water faucet on. It is important that you do not come into contact with any of the already treated areas—be sure to keep your shoes and person off and away from the product at all times.
- To begin the treatment, turn the switch from the “off” to the “on” position and with your thumb toward the hose connection. Water will mix with the product and the spray will begin to come out of the nozzle.
- Spray the entirety of the lawn completely and evenly taking care not to miss any spots. When the application is completed, wait a few hours before allowing pets or children to resume play.
Read the product label below for a more detailed account of application instructions. Be sure to read the product label thoroughly before application.

Be sure to check out the rest of our herbicide product family online here. For more information on weed control, read our Weed Control blog.