Active Ingredient and Mode of Action
Ricestar contains fenoxaprop-p-ethyl, an aryloxyphenoxypropionate (AOPP / Fop) graminicide belonging to HRAC Group 1.
It acts by inhibiting the acetyl-CoA carboxylase (ACCase) enzyme in grasses, blocking fatty acid synthesis and arresting cell membrane formation in weed meristems.
- ACCase Inhibition: Selectively blocks fatty acid biosynthesis in susceptible graminaceous weeds
- Isoxadifen-Ethyl Safener: Accelerates the enzymatic detoxification of fenoxaprop within rice plants, ensuring absolute crop safety
- Systemic Translocation: Absorbed rapidly through weed foliage and translocated basipetally to growing crown nodes and root tips
Target Grass Weeds and Application Window
Ricestar targets competitive annual and perennial grass weeds that reduce rice tillering and grain yields.
It is applied post-emergence when grass weeds are actively growing with 3 to 5 leaves.
- Barnyard Grass: Echinochloa crus-galli and Echinochloa colona (jungle rice)
- Crabgrass & Goosegrass: Digitaria sanguinalis and Eleusine indica in direct-seeded upland rice
- Sprangletop: Leptochloa chinensis infesting wet direct-seeded rice basins
- Application Window: Applied at 20 to 25 days after direct seeding or transplanting when weeds have 3 to 5 active leaves
Water Management and Application Standards
Effective foliar absorption requires proper water management before and after spray application.
Drain standing water from the paddy field 24 hours prior to spraying to expose target weed foliage, and re-flood 48 hours later.
- Water Level: Ensure grass weed foliage is fully exposed above the water line at the time of spray application
- Water Volume: Apply with 150 liters of water per acre using a flat-fan nozzle for uniform, drift-free coverage
- Rainfastness: Fast foliar absorption ensures rainfastness within 1 hour of application
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active ingredient in Bayer Ricestar?
Ricestar contains fenoxaprop-p-ethyl 6.7% EC formulated with the crop safener isoxadifen-ethyl.
Why does Ricestar not damage the rice crop?
It contains the proprietary safener isoxadifen-ethyl, which accelerates metabolic detoxification in rice plants while leaving grass weeds vulnerable.
Does Ricestar control broadleaf weeds or sedges?
No, Ricestar is a selective graminicide that specifically controls grassy weeds; broadleaf weeds and sedges require a companion broadleaf herbicide.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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