Active ingredient and larvicidal mode of action
Temephos acts as an acetylcholinesterase (AChE) inhibitor (IRAC Group 1B) in the nervous system of aquatic dipteran larvae. Absorbed through ingestion and cuticle contact, it disrupts nerve impulses, preventing mosquito wrigglers and midge larvae from completing their aquatic life cycle into flying adult disease vectors.
- Active constituent: Temephos 50% EC (emulsifiable concentrate) or 1% SG (sand granules)
- Chemical family: Organophosphate larvicide (IRAC Group 1B)
- Target specificity: Highly toxic to mosquito larvae (Culex, Anopheles, Aedes) with low toxicity to non-target fish at approved operational doses
Agricultural and livestock shed applications
- Farm drainage and waterlogged depressions: Applied to stagnant waterlogged pools around farmsteads to arrest mosquito breeding.
- Livestock slurry and lagoon channels: Controlling biting midges and flies that transmit bovine ephemeral fever and bluetongue.
- Granular sand application: Temephos 1% granules applied to rainfed puddles, water storage tanks, and canal edges.
Operational guidelines and safety precautions
Apply strictly at public health recommended doses (typically 1 part per million active ingredient). Never dispose of concentrated chemical containers directly into natural rivers or commercial fish aquaculture ponds. Always wear protective gloves and face masks during handling.
Official source
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National Vector Borne Disease Control Programme (NVBDCP) ↗Related on KisanPe
Common questions
What is the primary agricultural use of Temephos?
It is used as a larvicide to control mosquito and biting midge breeding in stagnant drainage channels, ditches, and farm water bodies.
Does Temephos kill adult flying mosquitoes?
No, Temephos is strictly a larvicide that targets aquatic larvae (wrigglers) and pupae, preventing adult emergence.
Is Temephos safe for non-target fish at operational doses?
Yes, when applied strictly at WHO and CIBRC approved operational larvicidal dosages, it has low toxicity to fish.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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