Pledge 50

Technical Profile: The Mechanism of Flumioxazin

At the core of 'Pledge 50' is flumioxazin, an active ingredient from the N-phenylphthalimide class. Unlike standard herbicides that block photosynthesis, this product acts as a protoporphyrinogen oxidase (PPO) enzyme inhibitor. In practical terms, this results in the rapid destruction of weed cell membranes as soon as the emerging shoot encounters the treated soil surface.

Soil Barrier and Selectivity

'Pledge 50' is a selective soil-applied herbicide that creates a 'protective shield' in the top layer of the soil. Upon contact with emerging weeds—such as common ragweed, velvetleaf, or common lambsquarters—the product causes immediate desiccation. A crucial technical feature is the low mobility of the active ingredient; it binds firmly to the upper soil horizon, preventing leaching and ensuring safety for the root systems of crops like sunflowers, soybeans, or corn, which grow deeper into the profile.

Application and Performance

• Formulation: Water-dispersible granules allow for easy mixing and low-dust handling when preparing the spray solution.
• Protocol: Designed for a single-pass application. Dosage rates range from 0.5 to 1.0 L/ha, depending on soil type and weed pressure.
• Spectrum: Highly effective against tough broadleaf weeds, including pigweed, wild mustard, and shepherd's purse.

Utilizing 'Pledge 50' eliminates early-season weed competition, allowing the crop to establish itself without stress. When following the 3rd hazard class safety guidelines and utilizing proper calibration of application equipment, the herbicide provides a sustained protection period, often eliminating the need for subsequent foliar treatments.