Sulfentrazone

Trade name(s) Spartan, Portfolio, Dismiss

Manufacturer(s) FMC Corp.

Formulation(s) 75% dispersible granule, 4 lb/gal flowable liquid

Remarks Soil-applied, preemergent triazolinone herbicide that can be applied either preplant incorporated or preemergence treatment. Note recropping intervals.

Water solubility 10 ppm at pH 5 and 300 ppm at pH 7

Storage conditions Stable in dry, cool conditions.

Acute toxicity LD50 - 2,416 mg/kg

Action in plant Disrupts cell membranes by inhibiting protoporphyrinogen oxidase (PPO) in the chlorophyll biosynthetic pathway, leading to a buildup of toxic intermediates.

Site of action Group 14: protoporphyrinogen oxidase inhibitor

Chemical family Triazinone

Koc 43 mL/g