Active Ingredients and Biochemical Mechanism
Odyssey blends imazamox (35%) and imazethapyr (35%) in a water-dispersible granule (70% WG) formulation.
Both molecules belong to the imidazolinone chemical family (HRAC Group 2), which inhibits the acetolactate synthase (ALS) enzyme crucial for synthesizing essential branched-chain amino acids (valine, leucine, and isoleucine) in weeds.
- Enzyme Inhibition: Blocks ALS synthesis, halting cell division and protein synthesis in susceptible weeds
- Dual Translocation: Rapidly absorbed through both foliage and roots, translocating throughout plant tissues
- Residual Protection: Provides initial contact knockdown combined with short-term pre-emergence soil activity
Approved Crops and Spectrum of Control
Odyssey is labeled for leguminous crops including soybean, groundnut, and blackgram (urad).
It controls difficult weeds such as Echinochloa, Commelina benghalensis (Bengal dayflower), Euphorbia geniculata, and Digitaria species.
- Soybean: Applied when the crop is at 2 to 3 trifoliate leaf stage and weeds are actively growing
- Pulses (Urad, Moong): Provides post-emergence suppression of competitive early weed flushes
- Target Weeds: Broadleaves (pigweed, wild poinsettia) and grasses (barnyard grass, crabgrass)
Application Protocol and Carryover Considerations
Apply Odyssey with the recommended non-ionic surfactant or vegetable oil concentrate to ensure optimal wax penetration on weed foliage.
Because imidazolinones exhibit persistent soil activity, adhere to recommended crop rotation guidelines before planting sensitive follow-on crops like mustard or maize.
- Water Volume: Use 150 to 200 liters of water per acre with flat fan nozzles for even ground coverage
- Adjuvants: Mix exclusively with approved surfactants as specified on the commercial packaging
- Soil Moisture: Effective absorption requires adequate soil moisture at the time of application
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What are the active ingredients in Odyssey herbicide?
Odyssey contains imazamox 35% plus imazethapyr 35% WG, both belonging to the imidazolinone class.
What is the best stage to apply Odyssey in soybean?
Apply at 15 to 20 days after sowing when weeds have 2 to 4 leaves and the soybean crop is in the 2 to 3 trifoliate stage.
Can Odyssey be used without a surfactant?
Using the manufacturer-provided adjuvant is essential for wetting and penetrating the waxy cuticles of weed leaves.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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