Active chemical class and bleaching mode of action
Tynzer contains Topramezone 33.6% SC, an active ingredient belonging to the pyrazolone chemical group of 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitors.
It works by blocking the HPPD enzyme, interrupting the synthesis of plastoquinones and carotenoid pigments. Deprived of protective carotenoids, the photosynthetic machinery in susceptible weed leaves is destroyed by solar radiation, resulting in intense white bleaching within 48 hours followed by plant necrosis.
- Active chemical: Topramezone 33.6% SC.
- HRAC classification: Group 27 (HPPD inhibitor / carotenoid biosynthesis inhibitor).
- High maize selectivity: Maize crops rapidly metabolize Topramezone into inactive compounds, ensuring complete vegetative crop safety.
Target weeds and approved application timing in maize
Tynzer is registered for selective post-emergence weed management in field corn, hybrid maize, sweet corn, and baby corn.
It controls major grassy weeds like Echinochloa alongside difficult broadleaf species that compete with young maize crops.
- Application window: Applied early post-emergence at 15 to 25 days after sowing when weeds are actively growing at 2 to 4-leaf stage.
- Grasses controlled: Echinochloa colonum, Digitaria sanguinalis, and Dactyloctenium aegyptium.
- Broadleaf weeds controlled: Trianthema portulacastrum, Amaranthus viridis, Digera arvensis, and Commelina benghalensis.
Adjuvant requirement, dilution, and spraying advice
To ensure maximum chemical absorption across waxy weed foliage, Tynzer must always be tank-mixed with its dedicated adjuvant (such as specialized methylated seed oil adjuvant) and flux partner.
Spray onto moist soil using clean water and flat fan nozzles operated with adequate canopy wetting volume.
- Mandatory adjuvant: Always mix with the prescribed adjuvant supplied in the commercial pack for optimal penetration.
- Soil moisture prerequisite: Apply when topsoil is moist; avoid spraying onto drought-stressed weeds under hot, dry conditions.
- Spray equipment: Use knapsack or power sprayer fitted with flat fan nozzles for uniform foliar droplet coverage.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
ICAR - Directorate of Weed Research ↗Related on KisanPe
Common questions
What is the active ingredient in BASF Tynzer herbicide?
Tynzer contains Topramezone 33.6% SC, a selective HPPD-inhibitor post-emergence herbicide for maize.
Why do weeds turn white after applying Tynzer?
Topramezone inhibits carotenoid synthesis, leaving chlorophyll unprotected from sunlight, causing rapid white bleaching and tissue death.
Why is an adjuvant mandatory with Tynzer?
The specialized adjuvant breaks the surface tension of spray droplets, allowing the active ingredient to penetrate waxy weed cuticles.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
More Crop Protection & Pesticides guides
Ask Sakhi AI in your language, check live mandi prices or plan a loan with KisanPe tools.