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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.
09/15/25
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
- 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
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.
Availability | Online |
Restricted Use | No |
Shipping Restrictions | 30 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 |
Brand | BAYER 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 Drawbacks | Watering or heavy rainfall can easily wash the product off of treated plants, requiring repeat applications. |
Target Pests | Barley, 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 Equipment | Backpack Sprayer, Pump Sprayer, Spray Rig |
Application Methods | Broadcast Spray, Spot Treatment |
Active Ingredient | Glyphosate 53.8% |
Product Type | Herbicide |
Formulation | Emulsifiable Concentrate (EC) |
Application 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. |
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. |
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. |
Use Sites | Outdoors |
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. |
Comparable Products | Eraser, Glyphosate 4 Plus, Glyphosate 5.4 Aquatic Herbicide |
Use Caution With | Bentgrass, Bermudagrass, Kentucky Bluegrass, Fescue, Fine, Fescue, Tall, Kikuyugrass, Ryegrass, St Augustine, Zoysiagrass |
Incompatible Home Siding | Brick, Hardie Plank, Stone Veneer, Stucco, Wood, Vinyl |
EPA Registration # | 524-343 |
Restricted Use | No |
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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 |
*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.