Quali-Pro Prodiamine 4L Pre-Emergent Herbicide — 40.8% Prodiamine 2.5 Gallon

Stop Weeds Before They Start — Season-Long Pre-Emergent Control with 40.8% Prodiamine

Pre-emergent weed control is the most cost-effective step in any professional turf or landscape weed management program. Stopping Annual Bluegrass, Crabgrass, and Foxtail before emergence eliminates the hand labor, repeat applications, and turf recovery costs associated with post-emergent programs. Quali-Pro Prodiamine 4L delivers 40.8% Prodiamine — the same active ingredient as Syngenta Barricade 4FL — in a liquid formulation sized for commercial applicators treating high-acreage accounts.

Prodiamine is a dinitroaniline herbicide (WSSA Group 3) that inhibits cell division in germinating weed seedlings by disrupting microtubule formation. Applied to the soil surface and watered in before target weeds germinate, it establishes a chemical barrier in the upper soil profile that controls weed seedlings as they emerge through treated soil. A single well-timed application can provide season-long suppression of target species through the critical spring or fall germination window.

Labeled for established turfgrasses (excluding golf course putting greens), lawns, sod nurseries, ornamentals, and Christmas tree farms, Prodiamine 4L covers the full range of professional turf and landscape weed prevention applications. The 2.5-gallon size delivers the best per-gallon value for operations managing large acreage across a full pre-emergent program.

Key Features & Benefits

• 40.8% Prodiamine — Barricade 4FL Equivalent — Delivers the same active ingredient at the same concentration as Syngenta Barricade 4FL, providing equivalent season-long pre-emergent control at a significantly lower cost for commercial turf managers.
• Prevents Annual Bluegrass (Poa annua) and Crabgrass — Controls the two most economically significant annual grass weeds in professional turf management, applied before germination to prevent emergence entirely.
• Season-Long Residual Control — Prodiamine's tight soil binding properties provide extended residual activity, with a single well-timed application controlling target weeds through the entire spring or fall germination window on most turf types.
• Controls Both Grassy and Broadleaf Weeds — Effective pre-emergent control of Annual Bluegrass, Foxtail, Goosegrass, Henbit, Knotweed, Chickweed, and Spurge in a single application.
• Low Movement in Soil Profile — Prodiamine's low water solubility and high soil binding reduce the risk of leaching through the root zone or runoff into water bodies compared to higher-mobility pre-emergent herbicides.
• Safe on Labeled Established Turfgrasses — Prodiamine 4L is safe for use on most established cool and warm season turfgrasses when applied at labeled rates. Do not apply to putting greens or newly seeded areas.
• 2.5-Gallon Commercial Size — Best per-gallon value for lawn care operators, golf course superintendents, and landscape contractors running pre-emergent programs across multiple properties.

Who Should Use Quali-Pro Prodiamine 4L

Prodiamine 4L is designed for lawn care operators, golf course superintendents, sports field managers, landscape contractors, nursery growers, and Christmas tree farmers who need reliable pre-emergent weed control at competitive cost per acre. It is the natural choice for operations currently purchasing Barricade 4FL or other branded Prodiamine products who are ready to reduce input costs without compromising program effectiveness. Home gardeners and DIY users managing large residential properties with annual weed pressure will also benefit from this professional-grade formulation.

Weeds Controlled

Prodiamine 4L controls Annual Bluegrass (Poa annua), Henbit, Knotweed, Chickweed, Spurge, Foxtail, and Goosegrass on labeled established turfgrasses, lawns, sod nurseries, ornamentals, and Christmas tree farms. Not registered for use in Alaska or on golf course putting greens.

Frequently Asked Questions

Is Quali-Pro Prodiamine 4L the same as Syngenta Barricade?

Yes. Prodiamine 4L contains 40.8% Prodiamine — the same active ingredient at the same concentration as Syngenta Barricade 4FL. It is a generic equivalent manufactured by Control Solutions, Inc. and registered for the same labeled weeds and use sites. Lawn care operators substitute it into existing Barricade programs at the same application rates without any changes to timing or calibration.

When should I apply Prodiamine 4L for best results?

Apply Prodiamine 4L before target weed germination for pre-emergent control. For spring crabgrass prevention, apply when soil temperatures at the 2-inch depth reach 50°F-55°F consistently — typically 2-3 weeks before forsythia bloom in most regions. For Annual Bluegrass control, fall applications before soil temperatures drop below 70°F are most effective. Always water in within 14 days of application to move the active ingredient into the germination zone.

Can Prodiamine 4L be used on newly seeded or overseeded turf?

No. Prodiamine 4L inhibits cell division in germinating seeds, which means it will also prevent desired turfgrass seed germination if applied before or shortly after seeding. Wait until established turf has gone through at least two mowing cycles before applying, or seed turf after the product's residual has dissipated — typically several months after application. Consult the label for specific timing guidelines for overseeding.

How does Prodiamine differ from Pendimethalin for pre-emergent control?

Both Prodiamine (Barricade) and Pendimethalin (Pendulum) are dinitroaniline herbicides (WSSA Group 3) with similar mechanisms of action and target weed spectrums. Prodiamine binds more tightly to soil particles than Pendimethalin, resulting in lower water solubility and longer residual activity in the soil profile. This often translates to better season-long control from a single application, particularly in high-rainfall regions.