FLUMIGARD SC Herbicide 64 oz, 1/2 Gallon
FLUMIGARD SC Herbicide 64 oz, 1/2 Gallon
$20488
Alligare Flumigard SC Herbicide is a fast-acting liquid flumioxazin herbicide for floating, emerged, and submersed aquatic weeds in slow-moving or quiet water. It gives pond and lake managers a flexible non-copper option, fits both surface and subsurface treatments, and works best on young, actively growing vegetation when strong coverage counts.
- Rapid contact action; built for quick knockdown on target growth
- Surface or subsurface use; match the treatment to weed position
- Non-copper option; useful where copper-sensitive sites matter
- Broad aquatic fit; labeled for ponds, lakes, canals, marshes, and reservoirs
- Clear follow-up timing; retreat based on regrowth and label intervals
- Program-friendly flexibility; works alone or in labeled tank-mix strategies
Choose Flumigard SC when you want fast aquatic weed control with practical treatment flexibility.
Always follow label directions.
Recommended companion treatment program
NT-MAX Lake & Pond Clarifier + Sludge & Muck Digester Rapidly restore crystal clear conditions in lakes, ponds, and lagoons using NT-MAX, a high-performance biological clarifier powered by….
After using Flumigard SC, wait about 5 days before applying NT-MAX Lake & Pond Clarifier + Sludge & Muck Digester.
Bundle savings may be available below when eligible.
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Product Description
Fast, Flexible Control for Tough Aquatic Weeds
When you need contact control in ponds, lakes, canals, ditches, or reservoirs, Flumigard SC gives you a concentrated liquid option for surface sprays on floating weeds and subsurface treatments for water-column control. It is especially useful when you want a non-copper option and rate guidance tied to water depth.
Key Features & Benefits
| Feature | Benefit |
|---|---|
| 42% flumioxazin, 4 lb/gal | Concentrated contact herbicide performance in a measurable liquid format. |
| Surface and subsurface options | Lets you treat floating foliage or build water-column concentration for submersed weeds. |
| Fast-acting contact activity | Fits situations where prompt knockdown matters. |
| Quick breakdown in water | Keeps performance tied to strong coverage and direct plant contact. |
| Water-use clarity after treatment | Drinking and recreation have no post-application hold; irrigation timing varies by rate and depth. |
Directions & Dosing Snapshot
| Use Case | Label Rate | Application Notes |
|---|---|---|
| Floating and emerged weeds | 6 to 12 fl oz per surface acre | Surface spray with an aquatic-approved adjuvant in a minimum of 30 gal water per acre; full coverage is essential. |
| Duckweed and watermeal | 200 ppb throughout the water body | Treat the infested water body thoroughly because escapes can quickly re-infest treated areas. |
| Submersed weeds at 1 ft average depth | 1.1, 1.6, or 2.1 pints per surface acre for 200, 300, or 400 ppb | Use lower to higher concentration based on weed biomass and maturity. |
| Submersed weeds at 2 to 4 ft average depth | 2 ft: 2.1, 3.2, 4.2 pints 3 ft: 3.2, 4.8, 6.4 pints 4 ft: 4.2, 6.4, 8.5 pints per surface acre for 200, 300, or 400 ppb |
Distribute evenly through the water column; early-morning treatment can improve results. |
| Submersed weeds at 5 ft average depth | 5.3, 8.0, or 10.6 pints per surface acre for 200, 300, or 400 ppb | Performance can drop in water above pH 8.5; treat dense vegetation in sections. |
Always follow the full label for complete directions, restrictions, and site-specific requirements.
Comparison Table
| Flumigard SC | Copper-Based Contact Algaecide | Systemic Aquatic Weed Herbicide | Beneficial Microbe Pond Maintenance Program | |
|---|---|---|---|---|
| Active ingredient / approach | Flumioxazin, Group 14 contact herbicide | Copper chemistry contact algaecide | Systemic aquatic weed chemistry | Beneficial microbes and enzymes |
| Primary job | Floating, emerged, and submersed weed control | Algae-focused knockdown | Plant-translocated weed control | Organic-load and sludge support |
| Application basis | 6 to 12 fl oz per surface acre or 200 to 400 ppb subsurface | Varies by label | Varies by label | Varies by product |
| Water-use planning | Drinking/recreation no hold; irrigation timing varies | Varies by label | Varies by label | Varies by product |
| Best-fit strategy | Rapid knockdown with flexible program building | When copper chemistry fits the site | When systemic movement is the priority | When long-term maintenance is the priority |
Why Choose a Fast Contact Aquatic Herbicide?
- Quick response: Fast contact activity helps you address visible growth before it becomes harder to cover.
- More treatment options: Surface spray and subsurface use let you match the application to the weed position in the water.
- Stronger program fit: Flumigard SC works as a standalone treatment or a labeled tank-mix partner when you need a practical next step.
This product is distributed by NewTechBio as an authorized reseller. Specifications, treatment rates, and performance claims are sourced from the official EPA-approved manufacturer label and published documentation. NewTechBio does not independently verify manufacturer claims. Always read and follow the label.
Last updated for listing accuracy: 05/18/2026
What is Flumigard SC and what is it best used for?
Does Flumigard SC control duckweed, watermeal, hydrilla, milfoil, coontail, pondweed, and filamentous algae?
Is Flumigard SC a good fit for ponds, lakes, reservoirs, canals, and drainage ditches?
How do surface spray and subsurface applications differ with Flumigard SC?
How much Flumigard SC do I need per surface acre or acre-foot?
How fast does Flumigard SC work, and when can I re-treat?
Can treated water still be used for swimming, fishing, or irrigation?
Is Flumigard SC a good non-copper option for aquatic weed and algae programs?
Why pair Flumigard SC with beneficial microbes in a long-term pond management plan?
What are the most important restrictions to know before buying Flumigard SC?
Products related to this item
Product Details
SKU: NTBIO3744511-HALF
UPC: 192702140020
Category: Herbicides
Brand: Alligare
Weight: 6 lbs
Dimensions: 9 x 7 x 8 in
Important Information
SDS: View Safety Data Sheet (PDF)
LABEL (Directions & Rates): View Product Label (PDF)
Comments/Other: Review the Product Label and SDS for directions, rates, and safety information.
Certifications / Registrations: EPA registered
Origin: Origin Unverified
Feature: Ideal for spot treatments and shoreline management
Product Form: Liquid
Product Details
Fast, Flexible Control for Tough Aquatic Weeds
When you need contact control in ponds, lakes, canals, ditches, or reservoirs, Flumigard SC gives you a concentrated liquid option for surface sprays on floating weeds and subsurface treatments for water-column control. It is especially useful when you want a non-copper option and rate guidance tied to water depth.
Key Features & Benefits
| Feature | Benefit |
|---|---|
| 42% flumioxazin, 4 lb/gal | Concentrated contact herbicide performance in a measurable liquid format. |
| Surface and subsurface options | Lets you treat floating foliage or build water-column concentration for submersed weeds. |
| Fast-acting contact activity | Fits situations where prompt knockdown matters. |
| Quick breakdown in water | Keeps performance tied to strong coverage and direct plant contact. |
| Water-use clarity after treatment | Drinking and recreation have no post-application hold; irrigation timing varies by rate and depth. |
Directions & Dosing Snapshot
| Use Case | Label Rate | Application Notes |
|---|---|---|
| Floating and emerged weeds | 6 to 12 fl oz per surface acre | Surface spray with an aquatic-approved adjuvant in a minimum of 30 gal water per acre; full coverage is essential. |
| Duckweed and watermeal | 200 ppb throughout the water body | Treat the infested water body thoroughly because escapes can quickly re-infest treated areas. |
| Submersed weeds at 1 ft average depth | 1.1, 1.6, or 2.1 pints per surface acre for 200, 300, or 400 ppb | Use lower to higher concentration based on weed biomass and maturity. |
| Submersed weeds at 2 to 4 ft average depth | 2 ft: 2.1, 3.2, 4.2 pints 3 ft: 3.2, 4.8, 6.4 pints 4 ft: 4.2, 6.4, 8.5 pints per surface acre for 200, 300, or 400 ppb |
Distribute evenly through the water column; early-morning treatment can improve results. |
| Submersed weeds at 5 ft average depth | 5.3, 8.0, or 10.6 pints per surface acre for 200, 300, or 400 ppb | Performance can drop in water above pH 8.5; treat dense vegetation in sections. |
Always follow the full label for complete directions, restrictions, and site-specific requirements.
Comparison Table
| Flumigard SC | Copper-Based Contact Algaecide | Systemic Aquatic Weed Herbicide | Beneficial Microbe Pond Maintenance Program | |
|---|---|---|---|---|
| Active ingredient / approach | Flumioxazin, Group 14 contact herbicide | Copper chemistry contact algaecide | Systemic aquatic weed chemistry | Beneficial microbes and enzymes |
| Primary job | Floating, emerged, and submersed weed control | Algae-focused knockdown | Plant-translocated weed control | Organic-load and sludge support |
| Application basis | 6 to 12 fl oz per surface acre or 200 to 400 ppb subsurface | Varies by label | Varies by label | Varies by product |
| Water-use planning | Drinking/recreation no hold; irrigation timing varies | Varies by label | Varies by label | Varies by product |
| Best-fit strategy | Rapid knockdown with flexible program building | When copper chemistry fits the site | When systemic movement is the priority | When long-term maintenance is the priority |
Why Choose a Fast Contact Aquatic Herbicide?
- Quick response: Fast contact activity helps you address visible growth before it becomes harder to cover.
- More treatment options: Surface spray and subsurface use let you match the application to the weed position in the water.
- Stronger program fit: Flumigard SC works as a standalone treatment or a labeled tank-mix partner when you need a practical next step.
SKU: NTBIO3744511-HALF
UPC: 192702140020
Category: Herbicides
Brand: Alligare
Weight: 6 lbs
Dimensions: 9 x 7 x 8 in
SDS: View Safety Data Sheet (PDF)
LABEL (Directions & Rates): View Product Label (PDF)
Comments/Other: Review the Product Label and SDS for directions, rates, and safety information.
Certifications / Registrations: EPA registered
Origin: Origin Unverified
Feature: Ideal for spot treatments and shoreline management
Product Form: Liquid
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Reviews
Verified Purchase
We had Starry weed? at our medical complex ponds and this worked great. Thanks!
Verified Purchase
Says it kills duckweed and it did. The end.
Verified Purchase
This helped clear our small pond.
Verified Purchase
Figuring out how to mix this, the math is tricky and you gotta mix it with at least 35 gallons of water, which is impossible with a regular backpack sprayer. Still, I eyeballed about 4 ounces for my half-acre pond, mixed it with just 2 gallons and a squirt of soap, and hit the watermeal on a breezy day. Five days later, 95% of that nasty stuff is gone. Super happy with how it worked. Will get more when needed.
Verified Purchase
Two application and watermeal is all gone in 4 weeks. Works great and did not hurt my fish.
Verified Purchase
No issues. Works.
