Product Description

Topramezone is a modern HPPD (4-hydroxyphenylpyruvate dioxygenase) inhibitor herbicide widely used in post-emergent weed management for corn, sorghum, sugarcane and other labeled crops. With excellent selectivity and rapid activity, it provides superior control of both annual broadleaf weeds and grasses, making it highly effective in fields infested with resistant weeds.As a systemic, foliar-absorbed herbicide, Topramezone moves quickly throughout the plant tissues. Susceptible weeds begin to show bleaching (whitening) within a few days after treatment due to carotenoid depletion, followed by complete death within 7–14 days. Corn and sorghum exhibit strong tolerance due to rapid metabolism of the active ingredient.

Product Specification Table

Key Features & Benefits

• HPPD inhibitor (Group 27 herbicide) with a unique mode of action

• Highly effective post-emergent control of broadleaf and grassy weeds

• Excellent performance against glyphosate-, ALS-, ACCase- and PPO-resistant weeds

• Fast bleaching effect; visible results within 3–5 days

• Outstanding crop safety in corn and sorghum

• Low application rate, reducing environmental load

• Compatible with common tank-mix partners (Atrazine, Nicosulfuron, Mesotrione, Tembotrione, etc.)

• Stable SC formulation with strong leaf penetration

• Widely used in modern corn production systems worldwide

Mode of Action 

Topramezone inhibits the 4-HPPD enzyme, interrupting carotenoid biosynthesis. Without carotenoids, chlorophyll becomes photo-oxidized, causing:

• Whitening / bleaching

• Growth inhibition

• Tissue necrosis and plant death

This mechanism makes it particularly effective for herbicide resistance management.

Target Weeds

Broadleaf Weeds

• Amaranthus spp.

• Lambsquarters (Chenopodium spp.)

• Ragweed (Ambrosia spp.)

• Morning glory (Ipomoea spp.)

• Pigweed species

• Velvetleaf and other common annual weeds

Grassy Weeds

• Barnyardgrass

• Foxtail species

• Goosegrass

• Crabgrass

• Setaria spp.

• Panicum species

Recommended Crops

• Corn (field, sweet, seed)

• Sorghum

• Sugarcane

• Non-crop areas (depending on registration)

Available Formulations

• Topramezone 97% TC (Technical grade)

• Topramezone 336 g/L SC (Suspension Concentrate)

• Custom formulations / mixtures available

• OEM / ODM services for distributors

Application Guidelines

(Rates depend on local regulations and label requirements.)

• Apply post-emergence, targeting weeds at 2–5 leaf stage

• Standard rate for 336 g/L SC: 35–70 g a.i./ha

• Recommended spray volume: 250–400 L/ha

• For resistant weeds, tank-mix with Atrazine or other compatible herbicides

• Avoid spraying under extreme drought, heat stress, or crop injury

Safety & Handling

• Low toxicity; follow standard pesticide safety precautions

• Wear gloves, protective clothing, and mask during application

• Avoid contamination of water bodies

• Restricted-Entry Interval (REI) according to local guidelines

• Keep out of reach of children and animals

Packaging Options

• 100 mL / 250 mL / 500 mL bottles

• 1 L / 5 L / 20 L HDPE containers

• 200 L drums for bulk supply

• Private label / customized packaging available

Storage Conditions

• Store in a cool, dry, and well-ventilated area

• Keep sealed and away from direct sunlight

• Shelf life: 2–3 years under proper storage conditions