Barricade 4FL Pre-Emergent Herbicide (Prodiamine)

5 out of 5 stars 1 Reviews | 10 Q&A

Barricade 4FL Pre-Emergent Herbicide - 4 oz. (Prodiamine)
Barricade 4FL Pre-Emergent Herbicide - 4 oz. (Prodiamine)

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Product Features

  • Prevents weeds season long with one application
  • Labeled for broad range of use sites, turf species and weeds controlled
  • Long lasting pre-emergent weed control with flexible application timing prior to emergence of weeds.

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Average Rating

5 out of 5 stars Rating: 5

1 Review | 10 Q&A

Product Overview

Barricade 4FL Herbicide is a pre-emergent herbicide offering low rate, season long control of over 30 broadleaf and grassy weeds that include goosegrass, Poa annua and crabgrass. Containing the active ingredient prodiamine, it prevents weeds from continuing to grow and stops the development of new seeded weeds. Applications can be applied as early as January and just one application will allow it to last the whole season.  All applications must be made before the targeted weeds germinate; Barricade 4FL will not control weeds after they have already emerged.  This product will not stain landscape features such as fences.

  • NOTE: This product has been opened and repackaged for extra security to avoid any spillage.

Features and Specs

Active Ingredient Prodiamine 40.7%
Target pests Barnyardgrass, Chickweed, Crabgrass (large, smooth), Foxtails, Goosegrass, Spurge, Witchgrass and others
* See label for complete list
For use in Turf: Lawns and Sod Nurseries; Container, Field Grown and Landscape Ornamentals; Perennial and Wildflower plantings and Christmas Tree Farms
Application 1 tsp. per Quart of water
0.5 oz. per 1,000 sq. ft.
21 oz. per 25 gallons of water per acre
* Use a Surfactant to Increase Effectiveness
* See label for complete application instructions
Pet safe Yes, if used as directed on Label
Formulation Professional Product
Group 3 Herbicide
Shipping Weight 10.05 lbs
Manufacturer Syngenta (Mfg. Number: 37150)
EPA Registration 100-1139


Barricade 4FL can be used alone with water or tank mixed with other herbicides.


Mixing alone: Must be mix thoroughly in spray tank to ensure uniform application. Fill spray tank 1/4 with clean water and start agitation. Add product and continue agitation throughout application. A spray colorant may be used to mark areas.

Tank Mixing: Test compatibility with other pesticide products before mixing. Follow chart on product label for specfic order and rates.

Look on product label for charts on types of weeds controlled and use rates on turfgrass and others.

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  • 5 of 5 Stars

    Great product, worked all season long

    By Jeffrey on 02/11/2019

    Verified Purchase

    I was really impressed by this product. For years I used Dimension 2EW and had to apply twice per year in heavy doses because of the soil type in my area (northern North Carolina Piedmont), sloped portions of yard, etc. For a while I was considering the WDG version of this, but was always hesitant as keeping the solution agitated enough concerned me. That said, this liquid is probably just as good if not better, especially using a backpack sprayer. I put down 1 oz per 1000 sq ft, which is a little higher than what the label suggests, but again, my soil conditions are unusual in that I have some sloped portions of my 1.25 acre yard and the soil in general is quite hard in areas, and somewhat sandy in others. Over this past season where we went through the remnants of two hurricanes and rainfall was nearly 30 inches above normal (normal is 45 inches per year, we got nearly 75 this year), crabgrass popped up in only very small patches, and only in and along the swale lines--a bit of post emergent spraying throughout September easily took care of these. There was literally no crab on the level areas all season long. All this said, please keep in mind one thing...this product does not do as well as Dimension 2EW on at least one other listed weed; it's performance on foxtail was less than I would have had with 2EW. But, to me, it's a small price to pay not having to spray twice per year, use less chemical at a lower cost, and have nearly eliminated my crabgrass problem--it is this area of the United States that invented crabgrass back in 1786 :)

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    39 of 40 people found this review helpful

Questions & Answers

Have a question about this product?
How much of Barricade 4FL should I use in a 1 gallon sprayer?

The label does not give specific info about mixing small amounts.

Herbicides are much different than other chemicals because water just acts as the carrier. In this case the product label recommends  you use .23 - 1.1 oz per 1,000 sq ft to be treated. Please read the product label to determine the exact usage rate for your needs as it varies according to the species of grass you have. Once you have determined the usage rate per 1,000 sq ft you can follow the outlined steps to decide how much water you should use per 1,000 sq ft (this will vary for every person as the type of equipment will be different and the walking speed of the applicator will be different).
1.Mark off an area that is 1,000 square feet (i.e. 20 by 50 feet or 25 by 40 feet).
2. Place the sprayer on a level surface and add water (no herbicide) noting the final level of water in the spray tank.
3. Spray the marked 1,000 sq ft  area with a sufficient volume of water to provide uniform coverage.
4.Refill the spray tank with the amount of water it took you to cover the 1,000 sq ft area
5. Add the pre-determined amount of herbicide that is needed to cover the 1,000 sq ft area to the spray tank.
Example: If the sprayer uses 1 gallon of water to cover 1,000 square feet and the desired application rate of the chosen herbicide is .80 fluid oz./1,000 square feet, then you would add .80 fluid ounces of the chosen herbicide to every 1 gallon of water to be used.

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28 of 46 people found this answer helpful

Why is a surfactant recommended with Barricade 4FL Herbicide?

Barricade 4FL Herbicide is only mixed with a surfactant/adjuvant when being tank mixed with a post emergent product for actively growing weed control.

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14 of 15 people found this answer helpful

Is there a shelf life for Barricade 4FL Herbicide?

Barricade 4FL Herbicide has a three year shelf life from the date of purchase if stored away from extreme temperatures.

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13 of 14 people found this answer helpful

Can Barricade 4FL Herbicide be tank mixed with Trimec herbicide?

Is it safe to tank mix Barricade and Trimec herbicide and spray my lawn with it?


Barricade 4FL Herbicide can be mixed with other herbicides as long to provide a broader spectrum of weed control or to control emerged weeds.  Make sure to follow instructions for rates and restrictions on each product label.

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12 of 16 people found this answer helpful

How long after application of Barricade 4FL can crops be used?

Can veggies be used if Barricade has been applied?

Barricade 4FL is not labeled for application to edible plants such as fruits and vegetables, so we not recommend consuming any of these plants where Barricade has been applied.

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11 of 13 people found this answer helpful

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