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

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

Prodiamine 4L is a pre-emergent herbicide that stops annual grassy and broadleaf weeds before they emerge, rather than treating them after they're already established in the turf. At 40.8% Prodiamine, it forms a chemical barrier at the soil surface that germinating weed seeds can't get through.

The label covers Annual Bluegrass (Poa annua), Crabgrass, Foxtail, Goosegrass, Chickweed, and Spurge, among other listed weeds, across established turfgrasses, lawns, sod nurseries, ornamentals, and Christmas tree farms, formulated by Control Solutions as a post-patent equivalent to a well-established pre-emergent active ingredient.

Key Features & Benefits

• 40.8% Prodiamine pre-emergent barrier — forms a chemical layer at the soil surface that blocks germinating weed seeds from establishing, rather than treating weeds that have already emerged.
• Controls Annual Bluegrass (Poa annua) — one of the most persistent cool-season turf weeds, along with Crabgrass, Foxtail, and Goosegrass among the listed grassy weeds.
• Controls Chickweed, Spurge, and other broadleaf weeds — the label covers broadleaf as well as grassy weed species for more complete pre-emergent coverage.
• Labeled across turf and ornamental sites — covers established turfgrasses, lawns, sod nurseries, ornamentals, and Christmas tree farms under one product.
• Post-patent formulation — manufactured by Control Solutions after the original active ingredient's patent protection lapsed, reflected in cost per acre relative to patent-era branded pricing.

Who Should Use This

This herbicide fits lawn care companies, sod nurseries, landscape professionals, and Christmas tree growers who need pre-emergent control of Annual Bluegrass, Crabgrass, and other listed weeds before they establish, rather than a post-emergent product for weeds that are already growing.

About Quali-Pro and Control Solutions, Inc.

Quali-Pro is a turf brand of Control Solutions, Inc. The maker is based in Pasadena, Texas. It calls itself a hybrid producer. That means both newer and post-patent formulas. This dual focus drives the Quali-Pro line. A patent eventually lapses on an active ingredient. Control Solutions then formulates its own version. That version reaches golf superintendents and lawn care firms. It also reaches other turf professionals. They pay less than patent-era branded pricing.

Frequently Asked Questions

How does a pre-emergent herbicide like Prodiamine 4L differ from a post-emergent product?

A pre-emergent herbicide forms a barrier at the soil surface that stops weed seeds from establishing as they germinate, so it has to go down before weeds emerge, not after. A post-emergent product instead treats weeds that are already visible and growing, which is a different application window and a different tool for a different stage of the weed life cycle.

When should Prodiamine 4L be applied for best results?

Pre-emergent herbicides need to be applied and watered in before target weeds germinate, which for weeds like Crabgrass and Annual Bluegrass typically means timing the application to soil temperature thresholds ahead of their germination window. Check the current product label and regional extension guidance for exact timing in your area.

Which weeds does this product control?

The label lists Annual Bluegrass (Poa annua), Crabgrass, Foxtail, Goosegrass, Chickweed, and Spurge, along with other listed grassy and broadleaf weeds. Confirm the current label for the complete weed list and application rates for your turf or landscape setting.

Can this herbicide be used on ornamentals and Christmas tree farms, not just turf?

Yes, the label covers established turfgrasses and lawns as well as sod nurseries, ornamentals, and Christmas tree farms. That range lets a single pre-emergent product serve both turf and select ornamental production settings.