Active Ingredient Profile and PPO Inhibition Mode of Action
Sumimax contains Flumioxazin (50% SC), an agricultural herbicide belonging to the N-phenylphthalimide chemical class.
It works by inhibiting the protoporphyrinogen oxidase (PPO) enzyme in the chlorophyll biosynthesis pathway of susceptible plants.
In the presence of sunlight, PPO inhibition generates high levels of singlet oxygen and toxic reactive oxygen species (ROS), which rapidly rupture cell membranes and destroy emerging weed seedlings.
- Formulation: 50 percent Suspension Concentrate (SC)
- Chemical barrier: Forms a durable chemical film on moist soil surfaces that destroys emerging weed shoots
- Sunlight activation: Reactive oxygen species rapidly lyse weed cell membranes upon sun exposure
Target Weed Spectrum and Approved Crop Applications
Sumimax is registered for pre-emergence application in soybean and for broad-spectrum vegetation clearance in non-crop industrial areas.
Applying within forty-eight hours of sowing provides several weeks of critical early-season weed suppression without crop competition.
- Broadleaf weed control: Effectively controls Commelina benghalensis, Digera arvensis, Amaranthus, and Trianthema species
- Annual grasses: Suppresses emerging Echinochloa colona, Digitaria, and Eleusine indica flushes
- Pre-emergence timing: Must be sprayed onto moist soil surfaces immediately following crop sowing before seedlings emerge
Spraying Instructions, Soil Moisture, and Safety
Optimal herbicidal performance requires adequate soil moisture to ensure uniform surface binding and activation.
Do not disturb or cultivate the soil profile following pre-emergence application, as mechanical disturbance ruptures the protective chemical barrier.
Wear standard personal protective equipment during chemical handling and spraying.
- Moisture requirement: Apply immediately after sowing when soil has optimal seedbed moisture
- Nozzle type: Flat fan nozzles deliver uniform coarse droplets that minimize drift and form a continuous soil barrier
- Safety apparel: Wear protective clothing, rubber gloves, and an approved dust respirator during mixing
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active chemical in Sumitomo Sumimax?
Sumimax contains Flumioxazin 50% SC, a broad-spectrum PPO inhibitor herbicide.
When should Sumimax be applied in soybean fields?
Apply pre-emergence within 48 hours of sowing onto moist soil before soybean or weed seedlings begin to emerge.
Why should soil not be disturbed after spraying a pre-emergence herbicide?
Cultivating or harrowing after application breaks the continuous chemical soil barrier, allowing buried weed seeds to germinate.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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