ACCase Inhibition and Crop Safener Technology
Fenoxaprop-p-ethyl selectively inhibits the acetyl-CoA carboxylase (ACCase) enzyme in monocotyledonous grasses, stopping fatty acid biosynthesis in growing shoots.
The inclusion of mefenpyr-diethyl safener accelerates the metabolic breakdown of the herbicide in wheat plants, ensuring high crop safety without phytotoxic stunting.
- Target weeds in wheat: Phalaris minor (canary grass / mandusi) and Avena fatua (wild oats).
- Grasses in broadleaf crops: Echinochloa colona, Digitaria sanguinalis, and Dactyloctenium aegyptium in soybean and groundnut.
- Safener mechanism: Mefenpyr-diethyl stimulates glutathione S-transferase enzymes in wheat, neutralizing the herbicide within crop cells.
- Visual symptoms: Susceptible grassy weeds stop growing within 48 hours, develop reddish-purple pigmentation, and collapse within 10 to 14 days.
Application Timing and Spray Guidelines
Herbicide efficacy requires applying when grassy weeds are young and actively growing with 2 to 4 leaves.
Ensuring adequate soil moisture after the first crown root irrigation enhances systemic chemical absorption.
- Wheat application timing: Apply 30 to 35 days after sowing, following the first irrigation when Phalaris minor has 2 to 4 leaves.
- Nozzle selection: Use flat fan or floodjet nozzles fitted to a calibrated knapsack sprayer to deliver uniform coarse droplets.
- Do not mix with 2,4-D: Avoid tank-mixing directly with 2,4-D or broadleaf herbicides if antagonism is indicated on the registered label.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the primary target weed of Fenoxaprop-p-ethyl 6.7% EC in wheat?
It primarily targets Phalaris minor (canary grass / gulli danda) and wild oats (Avena fatua) in wheat crops.
Why does Fenoxaprop-p-ethyl 6.7% EC contain a crop safener?
The mefenpyr-diethyl safener enables wheat plants to rapidly detoxify the herbicide, preventing crop yellowing or stunting.
Can Fenoxaprop-p-ethyl be mixed with 2,4-D herbicide?
No, tank-mixing with 2,4-D causes chemical antagonism that significantly reduces grass control; apply them separately with a few days interval.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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