Quali-Pro Mefenoxam 2 AQ Fungicide — 22.5% Mefenoxam 2.5 Gallon

Systemic Root and Stem Disease Control for Up to 3 Weeks — 22.5% Mefenoxam Aqueous Formula

Pythium and Phytophthora root and stem diseases are among the most destructive pathogens in turf, ornamental, and nursery production — and they spread fastest under the wet, warm conditions that are hardest to avoid. Quali-Pro Mefenoxam 2 AQ Fungicide delivers 22.5% Mefenoxam in a water-based, low-odor aqueous formulation that penetrates roots and stems systemically to stop these soilborne pathogens before they destroy stand density or plant health.

Mefenoxam is a Phenylamide fungicide (FRAC Group 4) that disrupts RNA synthesis in Oomycete pathogens, providing highly specific and highly effective control of Pythium spp., Phytophthora spp., and related water molds. A single application provides protection for up to 3 weeks, reducing application frequency compared to contact-only fungicides. The water-based AQ formulation produces low odor — a practical advantage in enclosed greenhouse environments and residential landscape settings where traditional EC formulations raise concerns.

Mefenoxam 2 AQ makes an excellent tank-mix partner with most other fungicides, including Quali-Pro's own Chlorothalonil for added Brown Patch control during stressful summer months. The 2.5-gallon size offers the best per-gallon economics for commercial operations running full-season Pythium and Phytophthora programs across multiple sites.

Key Features & Benefits

• 22.5% Mefenoxam — Maximum-Rate Aqueous Formulation — Delivers the phenylamide active ingredient at 22.5% concentration for strong systemic penetration into root and stem tissue where Pythium and Phytophthora establish.
• Up to 3 Weeks of Protection Per Application — Extended residual activity reduces the number of applications required per season, lowering total program cost and labor compared to shorter-residual contact fungicides.
• Water-Based, Low-Odor Formula — The AQ aqueous formulation avoids the strong solvent odor of EC formulations, making it more practical in greenhouse environments, enclosed nursery spaces, and residential landscape settings.
• Controls Pythium, Phytophthora, Downy Mildew, and Yellow Tuft — Targets the Oomycete pathogens responsible for damping-off, root rot, crown rot, and foliar blights that devastate seedlings and established ornamentals.
• Excellent Tank-Mix Compatibility — Combines cleanly with most other fungicides, including Chlorothalonil, expanding disease spectrum coverage in a single spray pass without formulation compatibility issues.
• 2.5-Gallon Size for Best Per-Gallon Value — Designed for commercial greenhouse growers, nursery operations, and turf management companies where Pythium or Phytophthora programs run across multiple sites and the full growing season.

Who Should Use Quali-Pro Mefenoxam 2 AQ

Mefenoxam 2 AQ 2.5 gallon is the product of choice for commercial greenhouse growers, nursery producers, golf course superintendents, and landscape contractors dealing with recurring Pythium or Phytophthora pressure at scale. It is particularly effective in high-moisture, high-temperature environments where Pythium damping-off in seedling production, Pythium blight in turf, or Phytophthora root rot in container nursery stock are ongoing seasonal threats. The low-odor AQ formulation makes it suitable for enclosed greenhouse and interior landscape environments where worker comfort is a consideration.

Diseases Controlled

Mefenoxam 2 AQ controls Pythium spp. (root rot, damping-off, Pythium blight), Phytophthora spp. (root rot, crown rot, foliar blight), Yellow Tuft, and Downy Mildew. Labeled for use in nursery, greenhouse, landscape, turf, and tree settings. Not registered for use in Alaska.

Frequently Asked Questions

Is Quali-Pro Mefenoxam 2 AQ the same as Subdue MAXX?

Yes. Mefenoxam 2 AQ contains 22.5% Mefenoxam — the same active ingredient and concentration as Syngenta Subdue MAXX. It is a generic equivalent manufactured by Control Solutions, Inc. and registered for the same labeled diseases and use sites. The AQ aqueous formulation shares the same active chemistry with a low-odor, water-based carrier.

What is the cost advantage of the 2.5-gallon size versus the 1-gallon?

The 2.5-gallon container delivers a lower cost per gallon compared to the 1-gallon size, making it the preferred choice for operations running Pythium or Phytophthora programs across multiple sites or through a full growing season. For smaller operations or those evaluating the product, the 1-gallon size (QCM83013852) is available.

How should Mefenoxam 2 AQ be applied for Pythium root rot in turf?

For Pythium root rot and Pythium blight in turf, apply as a foliar spray or soil drench at labeled rates, then water in lightly to move the active ingredient into the upper root zone. Timing is critical — apply before or at the first symptoms of Pythium activity during hot, humid conditions. Repeat applications at 14-21 day intervals based on disease pressure and label guidance.

Is Mefenoxam resistance a concern?

Mefenoxam resistance in Pythium and Phytophthora populations has been documented in some regions where phenylamide fungicides have been used exclusively over multiple seasons. Rotate Mefenoxam 2 AQ with fungicides from other FRAC groups — such as Group 33 phosphonates or Group 43 fluopicolide-containing products — to reduce selection pressure and maintain long-term program efficacy.