Weed Stop® For Lawns For St. Augustine & Centipede Lawns Concentrate (Ready-to-Spray)

Spectracide® Weed Stop® For Lawns For St. Augustine & Centipede Lawns Concentrate with atrazine controls tough weeds as listed – and it won't harm your lawn when used as directed. This hose-end concentrate formula kills established weeds, including dollarweed, sandspur and Florida betony, and prevents weeds from emerging in your lawn. The spray controls both emerged weeds and weeds from seeds. Apply to all varieties of St. Augustinegrass and centipedegrass when temperatures are below 90 degrees.

Spectracide® Weed Stop® For Lawns For St. Augustine & Centipede Lawns Concentrate is easy to use. Simply connect your hose to the QuickFlip™ hose-end sprayer and flip the switch to activate. Spray your lawn until wet to control weeds. Do not apply when daytime temperatures are above 90 degrees because injury to your lawn can occur. Read the entire label before using.

  • KILLS WEEDS, NOT THE LAWN™: Won't harm lawns when used as directed – controls both emerged weeds and weeds from seeds.
  • WITH ATRAZINE: For lawn weed control in all St. Augustinegrass varieties and centipedegrass.
  • CONTROLS TOUGH WEEDS: Kills established weeds, including dollarweed, sandspur and Florida betony.
  • HOSE-END CONCENTRATE: QuickFlip™ hose-end sprayer activates spray at the flip of a switch.
  • COVERAGE: Treats up to 3,720 sq. feet.

NOTE: Available only in AL, FL, GA, LA, MS, NC, SC, TX and VA


Active Ingredients

Atrazine 4.00%
Related compounds 0.08%
Other Ingredients 95.92%
Total: 100.00%
  • 32 fl oz
It is a violation of Federal law to use this product in a manner inconsistent with its labeling.

STOP Entry Restriction: Do not allow people or pets to enter the treated area until sprays have dried.

  1. Shake container well before using.
  2. Connect a garden hose to the sprayer nozzle. Make sure switch is fully forward in the “OFF” position.
  3. Turn on water at faucet. Extend hose to the farthest area to be treated and work back toward the faucet so you don’t come in contact with the treated area.
  4. To BEGIN spraying, point nozzle toward treatment site and pull switch backwards with thumb towards hose connection. Water will automatically mix with the product.
  5. Spray until wet to control weeds. Walk at a steady pace, working back toward the faucet while spraying using an even sweeping motion, slightly overlapping treated areas.
  6. To STOP spraying, push switch forward with thumb toward nozzle. Turn water off at faucet. To relieve pressure before removing nozzle from hose, pull switch backwards with thumb toward hose connection until water stops spraying.
  7. To STORE unused product, make sure switch is fully forward in the “OFF” position.
  8. Place in cool area away from heat, sunlight or open flame.
  • Do not use near desirable plants as injury may occur.
  • Do not apply under windy conditions.
  • Do not apply when temperatures exceed 90°F as lawn injury may occur.
  • Applications when temperatures are below 60°F may result in slower weed control.
  • Use only on healthy home lawns that are not under heat or drought stress and are reasonably free of insects, nematodes or diseases.
  • Sprigging listed grasses in treated areas is acceptable; however, some yellowing or stunting may occur.
  • Do not treat the same area twice.
  • Do not use on muck or alkaline soils.
  • Do not apply to areas where natural drainage would carry the spray to desirable plants.
  • Do not replant treated areas, except with listed grasses, within 12 months of application or injury may result.
  • Do not apply in the root zone of trees, ornamentals or vegetables or other desirable plants other than the listed grasses.
  • Do not overseed treated areas within six months after application or apply to newly seeded lawns for 60 days.
  • Do not apply this product in a way that will contact any person or pet, either directly or through drift. Keep people and pets out of the area during application.

This 32 fl oz container will treat 3,720 sq ft of listed grasses. Do not apply the entire container to an area less than 3,720 sq ft. Do not apply to the same area more than two times per year.

Weeds controlled or partially controlled in established St. Augustinegrass and Centipedegrass lawns:

  • annual bluegrass
  • chickweed (common and mouseear)
  • crabgrass(partial control)
  • cranesbill
  • cudweed
  • dichondra
  • dollarweed
  • Florida betony
  • henbit
  • knotweed
  • lespedeza 
  • moneywort
  • mustards
  • narrowleaf vetch
  • parsley-piert
  • pennywort (dollarweed)
  • sandspur
  • smutgrass
  • spurge
  • spurweed
  • swinecrest
  • woodsorrel and various annual clovers
Spurweed  Control can best be obtained by applying when spurweed has just emerged (December and January). 
Florida betony For best control, applications should be made in mid- to late October followed by a second application in mid- to late February.
Dichondra, moneywort
Apply in early April followed by a second application in July.

Note: Applications for control of spurweed or Florida betony will generally give control or partial control of the other listed weeds. However, this product will give best control when applied to tender young weeds or just prior to weed emergence.   
Spectracide® Weed Stop® For Lawns for St. Augustine & Centipede Lawns Concentrate may be applied during both dormant and growing seasons. Best results are obtained when application takes place in early spring or dormant periods when weeds are small or have not emerged. Do not apply more than twice per year to the same area.
This product will control both emerged weeds and weeds from seeds. Rain or watering within two or three days of application may decrease the effectiveness on emerged weeds. However, for the control of emerged weeds from seeds, rainfall or watering is needed within seven to 10 days after treatment.
Do not contaminate water, food or feed by storage and disposal.
Pesticide Storage: Store in a locked storage area. If product freezes, shake well before use once it has thawed.
Container Disposal: If empty: Nonrefillable container. Do not reuse or refill this container. Offer for recycling, if available.
Pesticide Disposal: If partly filled: Call your local solid waste agency for disposal instructions. Never place unused product down any indoor or outdoor drain.
Hazards to Humans and Domestic Animals
Harmful if swallowed or absorbed through skin. Avoid contact with skin, eyes or clothing.


If Swallowed: Call a Poison Control Center or doctor immediately for treatment advice. Have person sip a glass of water if able to swallow. Do not induce vomiting unless told to do so by a Poison Control Center or doctor. Do not give anything by mouth to an unconscious person.
If on Skin or Clothing: Take off contaminated clothing. Rinse skin immediately with plenty of water for 15 to 20 minutes. Call a Poison Control Center or doctor for treatment advice.
Note to Physician: There is no specific antidote for Atrazine. If the product is ingested, induce emesis or lavage stomach. The use of an aqueous slurry of activated charcoal may be considered.

Have the product container or label with you when calling a Poison Control Center or doctor for treatment advice.

Environmental Hazards
Atrazine can travel (seep or leach) through the soil and can enter groundwater, which may be used as drinking water. Atrazine has been found in drinking water. Users are advised not to apply to sand and loamy soils where the water table (groundwater) is close to the surface and where the soils are very permeable, i.e. well-drained. Your local agricultural agencies can provide further information on the type of soil in your area and the location of the groundwater.
This pesticide is toxic to aquatic invertebrates. Do not apply when weather conditions favor drift from treated areas. Runoff and drift from treated areas may be hazardous to aquatic organisms in neighboring areas. To protect the environment, do not allow pesticide to enter or run off into storm drains, drainage ditches, gutters or surface waters. Applying this product in calm weather when rain is not predicted for the next 24 hours will help to ensure that wind or rain does not blow or wash pesticide off the treatment area. Rinsing application equipment over the treated area will help avoid runoff to water bodies or drainage systems.

To the extent required by applicable law, buyer assumes all responsibility for safety and use not in accordance with directions.

Questions & Comments? Call 1-800-917-5438 or visit our website at www.spectracide.com