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BAYER CROP SCIENCE

AquaMaster (Roundup Custom Herbicide)

AquaMaster (formerly known as Roundup Custom Herbicide) is a non-selective weed and brush killer for aquatic and terrestrial use. This is a systemic herbicide with no residual soil activity and can effectively control over 190 post-emergent weeds.

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SKU
Roundup Custom Herbicide product page
Min : 91.06 - Max : 5260
Size
+ -
Price as of
09/15/25
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AquaMaster (formerly Roundup Custom Herbicide), manufactured by Bayer Crop Science, is a non-selective aquatic and terrestrial herbicide used to control over 190 annual and perennial weeds, brush, vines, and trees.

As a systemic herbicide, it will safely travel through the targeted weed's vascular system without leaving any residual soil activity behind. Once applied, unwanted vegetation shows results within 2 days for most annuals and 7 days for perennials.

AquaMaster provides flexibility in applying weed and brush control on land or in water.

Tools Needed

This product can be used with most pressurized sprayers, such as handheld and backpack sprayers, spray rigs, and industrial injection and aerial applicators.

How to Use

roundup application

  • Step 1: Determine how much AquaMaster to use by measuring the square footage of the treatment area. To do this, measure the treatment areas' length and width in feet, then multiply them together (length x width = square footage). The rate will vary depending on your targeted weed, application site, and desired solution concentration. For general ground vegetation management with 1 gallon of water, the concentration can vary from a 0.5% concentration (0.66 oz.) to an 8% concentration (10 oz.) per gallon of water. So, for example, if you wanted a 1% concentration, the rate is 1.3 oz. This will treat 1,000 sq. ft. If you measured an area of 2,000 sq. ft., you would need to mix 2.6 oz. in 2 gallons of water to cover the entire region.
  • Step 2: Fill your sprayer halfway with the required amount of water. Add the appropriate measured amount of product based on your calculations and agitate the sprayer. Add the remaining half of the water and agitate until the solution is well mixed.
  • Step 3: Spray the targeted weed, ensuring that the undesirable plant comes into direct contact with the chemical. Always consider drift and over-spraying so that plants that you do not want to be affected do not accidentally come into contact with the solution.

Where to Use

Spraying Roundup Custom Herbicide on railroad tracks

AquaMaster can be used in aquatic and terrestrial sites that require weed and brush management, such as ponds, crop and non-agricultural cropland, industrial sites, lawns, roadsides, and more. Non-agricultural crop sites include airports, apartment complexes, commercial sites, golf courses, lumber yards, manufacturing sites, natural areas, office complexes, public areas, parks, rights-of-way, parking lots, pastures, railroads, schools, utility sites, rangelands, and wildlife management areas.

When to Use

Use when you need fast and effective control of weeds and brush. Be sure to apply on a calm day when rain is not in the immediate forecast. Annual weeds are easiest to control when they are small. The best control of most weeds is obtained when you apply the product at late growth stages.

Safety Information

AquaMaster is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing or applying this product.

Keep people and pets off-treated areas until the spray solution has dried.

Special Considerations

Unless otherwise stated on the label, AquaMaster requires the use of a surfactant to mix into the solution. A surfactant is an adjuvant to help the solution stick to plant surfaces. This is important because the chemical solution must come into direct contact with the targeted plant to be most effective.

AquaMaster is the new name for Roundup Custom Herbicide. They share the same EPA registration number and label. It's a different name for the same great product.

AvailabilityOnline
Restricted UseNo
Shipping Restrictions30 Gallon Drum: AK, CA, CT, HI, IN, MI, NY, OR, RI, SC, VT, WA
250 Gallon: AK, CA, CT, HI, IN, MI, NY, OR, RI, SC, VT, WA
2.5 Gallon: AK, CA, CT, HI, IN, MI, NY, OR, RI, SC, VT, WA
BrandBAYER CROP SCIENCE
Keith's Pro Tips"Don't forget; RoundUp Custom Herbicide is a non-selective post-emergent herbicide. This means that it will only kill weeds that have already sprouted, but it also means that it could kill plants that you want to keep if they come into direct contact with the chemical. If you need to spray one plant while keeping others around it, cover the desirable plants so they won't accidentally get sprayed."
Product DrawbacksWatering or heavy rainfall can easily wash the product off of treated plants, requiring repeat applications.
Target PestsBarley, barnyardgrass, bittercress, brome, buttercup, cheatgrass, chickweed, cocklebur, crabgrass, cupgrass, fiddleneck, fleabane, foxtail, geranium, goosegrass, groundsel, henbit, itchgrass, johnsongrass, knotweed, kochia, lambsquarters, morningglory, mustard, oats, panicum, pennycress, pigweed, ragweed, red rice, ryegrass, sandbur, shattercane, smartweed, sorghum, spurge, sunflower, thistle, wheat, witchgrass, and many other listed grasses and weeds.
Application EquipmentBackpack Sprayer, Pump Sprayer, Spray Rig
Application MethodsBroadcast Spray, Spot Treatment
Active IngredientGlyphosate 53.8%
Product TypeHerbicide
FormulationEmulsifiable Concentrate (EC)
Application RateFor .5% mixture you will use 2/3 oz to 1 gallon of water. For a 1% mixture you will use 1.3 oz per 1 gallon of water. For a 4 % mixture you will use 5 oz per 1 gallon of water. For more specific application rates please refer to the label.
Shelf LifeRoundUp Custom can last 3 years in storage when kept in a cool, dry place. This is best stored in rooms around 68 degrees F to prevent the product from crystallizing.
YieldIf Roundup Custom Herbicide is used at the higher rate of use as a weed control, trim-and-edge, or bareground treatment each 2.5 gallon container will treat an estimated 38,000 square feet.
Use SitesOutdoors
Time to KillRoundup Custom Herbicide provides immediate results but may take up to several treatments to gain full control of target weeds. Effects are visible on most annual weeds within 2 to 4 days but on most perennial weeds, it make take a week or longer.
Comparable ProductsEraser, Glyphosate 4 Plus, Glyphosate 5.4 Aquatic Herbicide
Use Caution WithBentgrass, Bermudagrass, Kentucky Bluegrass, Fescue, Fine, Fescue, Tall, Kikuyugrass, Ryegrass, St Augustine, Zoysiagrass
Incompatible Home SidingBrick, Hardie Plank, Stone Veneer, Stucco, Wood, Vinyl
EPA Registration #524-343
More Information
Restricted Use No
Shipping Restrictions AK, CA, CT, HI, IN, MI, NY, OR, RI, SC, VT, WA
Availability Online
Signal Word CAUTION
Keith's Pro Tip "Don't forget; RoundUp Custom Herbicide is a non-selective post-emergent herbicide. This means that it will only kill weeds that have already sprouted, but it also means that it could kill plants that you want to keep if they come into direct contact with the chemical. If you need to spray one plant while keeping others around it, cover the desirable plants so they won't accidentally get sprayed."
Target Pests Multi Barnyardgrass, Bittercress, Brome, Buttercup, Cheatgrass, Chickweed, Cocklebur, Crabgrass, Cupgrass, Fiddleneck, Fleabane, Foxtail, Geranium, Goosegrass, Groundsel, Henbit, Itchgrass, Johnsongrass, Knotweed, Kochia, Lambsquarters, Morningglory, Oats, Panicum, Pennycress, Pigweed, Ragweed, Red Rice, Ryegrass, Sandbur, Shattercane, Smartweed, Spurge, Sunflower, Thistle, Wheat, Witchgrass, Barley, Mustard
Time to Kill Roundup Custom Herbicide provides immediate results but may take up to several treatments to gain full control of target weeds. Effects are visible on most annual weeds within 2 to 4 days but on most perennial weeds, it make take a week or longer.
Chemical Type Herbicide
Formulation Emulsifiable Concentrate (EC)
Application Methods Broadcast Spray, Spot Treatment
Product Drawbacks Watering or heavy rainfall can easily wash the product off of treated plants, requiring repeat applications.
Active Ingredient Glyphosate 53.8%
Application Equipment Backpack Sprayer, Pump Sprayer, Spray Rig
Mix Rate For .5% mixture you will use 2/3 oz to 1 gallon of water. For a 1% mixture you will use 1.3 oz per 1 gallon of water. For a 4 % mixture you will use 5 oz per 1 gallon of water. For more specific application rates please refer to the label.
Use Sites Outdoors
Yield If Roundup Custom Herbicide is used at the higher rate of use as a weed control, trim-and-edge, or bareground treatment each 2.5 gallon container will treat an estimated 38,000 square feet.
EPA Registration No. 524-343
Shelf Life RoundUp Custom can last 3 years in storage when kept in a cool, dry place. This is best stored in rooms around 68 degrees F to prevent the product from crystallizing.
Comparable Products Eraser, Glyphosate 4 Plus, Glyphosate 5.4 Aquatic Herbicide
Children or pets? No
Property Characteristics None

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