Protoporphyrinogen Oxidase (PPO) Mode of Action
Oxyfluorfen acts as an inhibitor of the protoporphyrinogen oxidase (PPO) enzyme in plant chlorophyll synthesis. In the presence of sunlight, PPO inhibition leads to the formation of reactive oxygen species that disrupt lipid membranes, causing rapid cell desiccation and necrosis.
When applied to soil, it forms a light-activated chemical barrier on the surface that destroys emerging weed seedlings as they pierce through.
- Target broadleaf weeds: Chenopodium album, Amaranthus viridis, Portulaca oleracea, and Euphorbia spp.
- Target grasses: Echinochloa spp. and Digitaria sanguinalis at early seedling emergence.
- Soil barrier: Provides weeks of residual suppression when the treated soil surface remains undisturbed.
- Approved crops: Onion, garlic, tea, potato, cotton, and direct-seeded rice per CIBRC registration parameters.
Application Timing and Soil Preparation
Pre-emergence performance requires a well-prepared, clod-free seedbed with adequate soil moisture at the time of application.
Applicators must avoid disturbing the treated soil barrier with subsequent mechanical hoeing or inter-cultivation.
- Apply pre-emergence within 0 to 3 days after transplanting or sowing prior to crop and weed emergence.
- In onion nurseries, apply pre-emergence or directed post-emergence following official label guidelines.
- Wear protective gloves, rubber boots, and safety goggles to prevent dermal irritation during mixing.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What chemical group does Oxyfluorfen belong to?
Oxyfluorfen belongs to the diphenyl ether chemical class (HRAC Group 14), functioning as a PPO inhibitor.
How does Oxyfluorfen control weeds as a pre-emergence herbicide?
It forms a light-activated chemical barrier on the soil surface that disrupts cell membranes of emerging weed shoots upon sun exposure.
Can Oxyfluorfen be used in onion and garlic crops?
Yes, it is widely registered for selective pre-emergence and directed early post-emergence weed control in onion and garlic fields.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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