Active chemical composition and PPO inhibition
Affinity contains Carfentrazone-ethyl 40% DF, an active compound belonging to the triazolinone chemical family.
It works by inhibiting the enzyme protoporphyrinogen oxidase (PPO / Protox) in the chlorophyll biosynthesis pathway. This causes an accumulation of reactive porphyrins that, in the presence of sunlight, rupture plant cell membranes and lead to rapid necrosis of susceptible weed foliage.
- Active chemical: Carfentrazone-ethyl 40% DF.
- HRAC classification: Group 14 (PPO enzyme inhibitor).
- Rapid action: Foliar desiccation symptoms appear within 24 to 48 hours of application under bright sunshine.
Target broadleaf weeds and application timing in wheat
Affinity is specifically registered for selective post-emergence broadleaf weed management in wheat.
It is celebrated for providing control over tough, invasive broadleaf species that show resistance or tolerance to 2,4-D or Metsulfuron-methyl.
- Application window: Applied post-emergence at 25 to 35 days after sowing when broadleaf weeds are small (2 to 6 leaves).
- Key weeds controlled: Malwa parviflora (mallows), Chenopodium album (bathua), Melilotus indica (senji), and Rumex dentatus (kandiari).
- No soil residue: Rapidly degrades in soil, eliminating residual carryover hazards to sensitive rotational summer crops.
Surfactant requirement, dilution, and spraying advice
To achieve complete weed control, Carfentrazone-ethyl must be applied with a suitable non-ionic surfactant or adjuvant as directed on the product label.
Ensure uniform foliar droplet coverage using flat fan nozzles operated with sufficient clean water volume.
- Adjuvant inclusion: Mix with the recommended surfactant to ensure thorough wetting of waxy broadleaf weed cuticles.
- Spray nozzle: Use flat fan nozzles with uniform spacing along the spray boom; avoid floodjet nozzles that produce coarse uneven droplets.
- Protective measures: Wear protective gloves, eye goggles, and protective footwear during preparation and field spraying.
Official source
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ICAR - Indian Institute of Wheat and Barley Research ↗Related on KisanPe
Common questions
What is the active ingredient in FMC Affinity herbicide?
Affinity contains Carfentrazone-ethyl 40% DF, a selective PPO-inhibitor broadleaf herbicide.
Which problematic weeds does Affinity control in wheat?
It specifically controls Malva parviflora, Chenopodium album, Rumex dentatus, and Melilotus species in wheat fields.
Does Affinity leave chemical residues that harm subsequent crops?
No, Carfentrazone-ethyl breaks down rapidly in the soil and poses zero carryover risk to rotational crops.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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