Spectracide® Weed Stop® For Lawns Plus Crabgrass Killer Concentrate (Ready-to-Spray)

Use Spectracide Weed Stop For Lawns Plus Crabgrass Killer Concentrate (Ready-to-Spray) to kill over 250 types of weeds as listed, including crabgrass. The product produces visible results in 8 hours. This product kills broadleaf and troublesome grass weeds including dandelion, chickweed and clover as well as crabgrass, foxtail and yellow nutsedge, see product label for complete list of weed types. Apply when daytime temperatures are between 45°F and 90°F. Do not apply to Bermudagrass when daytime temperatures exceed 85°F.

  • Kills yellow nutsedge
  • See results in 8 hours
  • Kills over 250 weed types as listed, including crabgrass
  • Won't harm lawns when used as directed
  • Treats up to 5,000 square feet

Active Ingredients

2,4-D, dimethylamine salt 3.74%
Quinclorac 1.79%
Dicamba, dimethylamine salt 0.43%
Sulfentrazone 0.22%
Other Ingredients 93.82%
Total 100.00%
0.264 lb. 2,4-dichlorophenoxyacetic acid equivalent per gallon or 3.11%
0.152 lb. 3,7-dichloro-8-quinolinecarboxylic acid per gallon or 1.79%
0.030 lb. 3,6-dichloro-o-anisic acid equivalent per gallon or 0.36%
0.019 lb. N-[2,4-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]phenyl]methanesulfonamide per gallon or 0.22%
Isomer Specific by AOAC Method.
  • 32 fl oz


  • amaranth, purple
  • amaranth, slender
  • artichoke
  • aster, heath
  • aster, purple
  • aster, white heath
  • aster, white prairie
  • Austrian fieldcress
  • bedstraw, catchweed
  • bedstraw, northern
  • bedstraw, pineywoods
  • bedstraw, smooth
  • beggarticks, hairy
  • betony, Florida
  • bindweed, field
  • bindweed, hedge
  • bitter wintercress
  • bittercress, hairy
  • bitterweed
  • black-eyed Susan
  • black medic
  • blood flower milkweed
  • blue lettuce
  • brassbuttons
  • bristly oxtongue
  • broomweed
  • buckhorn
  • bullnettle
  • burclover
  • burdock
  • burweed, lawn (spurweed)
  • buttercup, bulbous
  • buttercup, creeping
  • buttonweed, common (poorjoe)
  • buttonweed, Virginia
  • Carolina geranium (wild)
  • carpetweed
  • catnip
  • catsear, spotted (false dandelion)
  • chamber bitter
  • chickweed, common
  • chickweed, mouseear
  • chickweed, sticky
  • chicory
  • cinquefoil
  • clover, alsike
  • clover, crimson
  • clover, hop
  • clover, rabbit foot
  • clover, red
  • clover, strawberry
  • clover, white
  • clover, white sweet
  • clover, yellow sweet
  • cockle
  • cocklebur
  • cocklebur, oriental
  • cocklebur, spiny
  • common mullein
  • corn spurry
  • creeping beggarweed
  • creeping Jenny (creeping Charlie)
  • Cudweed
  • cupid shaving brush
  • daisy, English
  • daisy, oxeye
  • dandelion, common
  • dandelion, false
  • day flower
  • deadnettle
  • dichondra
  • dock, broadleaf
  • dock, curly
  • dogbane
  • Dogfennel
  • dollarweed (pennywort)
  • doveweed
  • elderberry
  • false sunflower
  • falseflax
  • fiddleneck
  • filaree, redstem
  • filaree, whitestem
  • fleabane, daisy (annual)
  • fleabane, rough
  • galinsoga, hairy
  • galinsoga,  smallflower
  • goldenrod
  • ground ivy
  • groundsel
  • gumweed
  • hairy fleabane
  • hawkweed, meadow
  • hawkweed, mouseear
  • hawkweed, orange
  • hawkweed, yellow
  • healall
  • heartleaf drymary
  • hemp
  • henbit
  • hoary cress
  • horsenettle
  • horseweed
  • jimsonweed
  • Johnny-jumpup violet
  • knawel
  • knotweed, prostrate
  • kochia
  • lambsquarters
  • lespedeza
  • mallow, alkali
  • mallow, bristly
  • mallow, common
  • mallow, dwarf
  • mallow, Venice
  • marcela
  • matchweed
  • Mexicanweed
  • moneywort
  • morningglory, bigroot
  • morningglory, ivyleaf
  • morningglory, Mexican
  • morningglory, red
  • morningglory, tall
  • morningglory, woolly
  • mugwort
  • mustard, ball
  • mustard, black
  • mustard, blue
  • mustard, hedge
  • mustard, Indian
  • mustard, tansy
  • mustard, tumble
  • mustard, white
  • mustard, wormseed
  • nettle, stinging (burning)
  • nettle, tall
  • nettle, wood
  • parsley-piert
  • parsnip
  • pearlwort
  • pennycress (Frenchweed)
  • pepperweed, perennial
  • pepperweed, Virginia (peppergrass)
  • pigweed, prostrate
  • pigweed, redroot
  • pigweed, Russian
  • pigweed, smooth
  • pigweed, tumble
  • pineappleweed
  • plains coreopsis (tickseed)
  • plantain, blackseed
  • plantain, bracted
  • plantain, broadleaf
  • plantain, buckhorn
  • plantain, hoary
  • plantain, narrowleaf
  • plantain, slender
  • plantain, woolly
  • poison ivy
  • poison oak
  • pokeweed
  • prairie sunflower
  • prickly lettuce (compass plant)
  • prickly sida
  • prostrate knotweed
  • puncturevine
  • purslane, common
  • pusley, Brazil
  • pusley, Florida
  • pusley, large flower
  • ragweed, bur
  • ragweed, common
  • ragweed, lanceleaf
  • ragweed, western
  • redstem filaree
  • rough cinquefoil
  • scarlet pimpernel
  • shepherdspurse
  • smartweed, ladysthumb
  • smartweed, pale
  • smartweed, Pennsylvania
  • smooth chaff-flower
  • smooth dock
  • sorrel, red (sheep)
  • sowthistle, annual
  • sowthistle, spiny
  • spanish needles
  • speedwell, bi-lobed
  • speedwell, common
  • speedwell, corn
  • speedwell, ivyleaf
  • speedwell, Persian
  • speedwell, purslane
  • speedwell, slender
  • speedwell, snow
  • speedwell, thymeleaf
  • spiny amaranth
  • spurge, prostrate
  • spurge, spotted
  • spurweed
  • star of Bethlehem
  • strawberry, Indian mock
  • tansy ragwort
  • Tanweed
  • thistle, blessed
  • thistle, bull
  • thistle, Canada
  • thistle, flodman (prairie)
  • thistle, musk
  • thistle, platte
  • thistle, plumeless
  • thistle, Russian
  • thistle, Scotch
  • thistle, wavyleaf
  • thistle, yellow (horrible)
  • trailing crownvetch
  • velvetleaf
  • vervain, blue
  • vervain, hoary
  • vervain, prostrate
  • vervain, tall
  • vetch, bird
  • vetch, hairy
  • vetch, milk
  • vetch, narrowleaf
  • vetch, wild
  • Virginia creeper
  • western clematis
  • western salsify
  • wild aster
  • wild buckwheat
  • wild carrot
  • wild four-o-clock
  • wild garlic
  • wild lettuce
  • wild marigold
  • wild mustard (yellow rocket)
  • wild onion
  • wild parsnip
  • wild radish
  • wild rape
  • wild strawberry
  • wild sweet potato
  • wild violet
  • woodsorrel, creeping
  • woodsorrel, violet
  • woodsorrel, yellow (oxalis)
  • woolly croton
  • wormseed
  • yarrow, common
  • yarrow, western
  • yarrow, yellow


GRASS WEEDS CONTROLLED: Crabgrass, large and smooth; foxtail, green, yellow and giant; barnyardgrass; nutsedge, yellow
It is a violation of Federal law to use this product in a manner inconsistent with its labeling. For outdoor residential use only.


  • 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.
  • Do not allow people or pets to enter the treated area until sprays have dried.

Spectracide® Weed Stop® for Lawns Plus Crabgrass Killer Concentrate is a selective herbicide that controls emerged broadleaf and grass weeds in established lawns. Symptoms you may expect to see on affected broadleaf weeds include leaf reddening, leaf and stem curling and twisting, chlorosis and necrosis. Symptoms expected on grass weeds include stunting, chlorosis, gradual reddening and necrosis. 

This product is intended for use by homeowners on residential lawns. This product should be applied only to the following species of turfgrass:
Cool season turfgrass: Kentucky bluegrass; perennial ryegrass; fescue spp., including tall, red and fine leaf fescues
Warm season turfgrass: Bermudagrass**, zoysiagrass, buffalograss 

**Application to Bermudagrass may cause temporary yellowing or discoloration, but full recovery can be expected. Do not apply to Bermudagrass when daytime temperatures exceed 85°F.

DO NOT USE this product on lawns containing bentgrass, St. Augustinegrass, bahiagrass, centipedegrass, carpetgrass. Also, do not use on dichondra, or lawns with desirable clovers or legumes. Do not use on vegetable gardens, fruits or ornamentals (flowers, trees, groundcovers, hedges, landscape/flower beds and shrubs).
Apply this product to actively growing weeds during the early growth stages for the best results. Apply in spring or fall when daytime temperatures are between 45°F and 90°F. Fall applications may control winter annual and biennial weeds that may otherwise resprout the following spring. For heavy grass weed pressure, apply a second application at the same rate, 14 days after the first application.

CRABGRASS (large and smooth):
For the best results, apply this product from crabgrass emergence until the six-leaf stage (two tillers) or before the crabgrass is 3-4 inches in height. Generally, this period begins or corresponds to the first time that you can see crabgrass in your lawn. Use two applications at the same rate with a 14-day interval for dense populations.
See the following table for calculating the correct amount of product to use for the area to be treated.
The maximum application rate is 6½ fl oz of product per 1,000 sq ft per application (0.6 lb 2,4-D acid equivalent per acre per application).
The maximum number of broadcast applications is limited to two per year.
The maximum seasonal rate is 13 fl oz of product per 1,000 sq ft (1.2 lb 2,4-D acid equivalent per acre), excluding spot treatments.


  1. Shake container well before using.
  2. Connect a garden hose to the Ready Spray nozzle. Make sure the dial on the nozzle is in the “OFF” position with the safety tab in the valve notch.
  3. Turn on water at faucet. Extend hose to the farthest area to be treated and work toward the faucet.
  4. To BEGIN spraying, point nozzle toward lawn
         a) bend the safety tab (located at right of dial) back and hold,
         b) using your other hand, QUICKLY turn the dial clockwise until it stops. Water will automatically
             mix with the product.
  5. Spray until wet to control weeds. Walk at a steady pace while spraying using an even sweeping motion, slightly overlapping treated areas. One quart will treat up to 5,000 sq ft of Southern or Northern grasses.
    For rectangular areas, calculate square feet by multiplying length by width. Refer to sight gauge to guide coverage (example: when bottle is half empty, you should have covered half the area).
  6. To STOP spraying, QUICKLY turn the dial in the opposite direction of “ON” (counterclockwise) until it stops and the safety tab engages into the notch. Turn water off at faucet. To relieve pressure before removing nozzle from hose, bend the safety tab back and turn dial “ON” until water stops spraying.
  7. To STORE unused product, make sure the dial is in the “OFF” position with the safety tab in the valve notch.

Application rates for lawns using the Ready Spray Nozzle. 

Turfgrass Total treated area for 1 qt (32 fl oz) sprayer Amount of herbicide applied per 1,000 sq ft
Kentucky bluegrass, fescue spp., perennial ryegrass, zoysiagrass, Bermudagrass** and buffalograss
5,000 sq ft 6.4 fl oz

**Application to Bermudagrass may cause temporary yellowing or discoloration, but full recovery can be expected. Do not apply to Bermudagrass when daytime temperatures exceed 85˚F.

Adequate moisture and mild environmental conditions enhance the performance of this product. Applications should be made to actively growing weeds. Apply when daytime temperatures are between 40°F and 90°F. Avoid applications of this product when turfgrasses are under stress since injury may result.

For newly seeded areas:

  • Do not apply within four weeks after seedling emergence of Kentucky bluegrass, fine fescue blends and perennial ryegrass. Apply this product to newly seeded grasses when well-established (approximately six weeks after seedling emergence) or after the third mowing.

For newly sodded, sprigged or plugged areas:

  • The application of this product to newly sodded, sprigged or plugged grasses should be delayed until three to four weeks after the sodding, sprigging or plugging operations.


  • Turf species listed on this label can be seeded into the treated areas at four weeks after the application of this product.


  • Do not apply this product immediately before rainfall or irrigation. For best results, do not irrigate or water the turfgrass within 24 hours after application.
  • If dry conditions exist, a scheduled irrigation or watering 24 hours before and 24 hours after application is recommended.


  • Delay mowing two days before and until two days after the application of this product. Additional stress from low mowing heights may increase the possibility of turf injury.
  • Clippings from the first three mowings should be left on the treated area. Do not use clippings from the treated areas as mulch or compost around flowers, ornamentals or trees or in vegetable gardens.


  • Do not treat when air temperatures exceed 85°F as damage to grass may occur.
  • Application at rates above specified on this label may cause injury to turfgrass.
  • Do not apply this product to food crops (gardens and vegetables), forage crops or ornamental plants, including flowers, trees, shrubs, hedges, woody ornamentals, groundcovers established in landscape plantings and other nontarget plants.
  • Do not spray exposed roots of ornamentals and trees.
Do not contaminate water, food or feed by storage or disposal.
Pesticide Storage: Store in original container in an area inaccessible to children and pets.
Pesticide Disposal and Container Handling: Nonrefillable container. Do not reuse or refill this container.  If empty: Place in trash or offer for recycling if available.
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
. Causes moderate eye irritation. Avoid contact with eyes or clothing. Harmful if swallowed. When using this product, wear long-sleeved shirt, long pants, socks, shoes and rubber gloves.
Wash thoroughly with soap and water after handling. After using this product, rinse gloves before removing, remove clothing and launder separately before reuse, and promptly and thoroughly wash hands and exposed skin with soap and water. Remove saturated clothing as soon as possible and shower.

First Aid
If in eyes:
  • Hold eye open and rinse slowly and gently with water for 15-20 minutes.
  • Remove contact lenses, if present, after the first five minutes, then continue rinsing eye.
  • Call a Poison Control Center or doctor for treatment advice.
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 by a Poison Control Center or doctor.
  • Do not give anything to an unconscious person.
Have the product container or label with you when calling a Poison Control Center or doctor, or going for treatment. You may also contact 1-800-917-5438 for emergency medical treatment advice.

This pesticide is toxic to fish and aquatic invertebrates. Drift and runoff may be hazardous to aquatic organisms in water adjacent to treated 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.

Do not use or store near heat or open flame.

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