Chemical Class and Tri-Action Mode of Action
Chlorpyrifos belongs to the phosphorothioate organophosphate chemical family (IRAC Group 1B), functioning as an acetylcholinesterase inhibitor.
Unlike purely contact insecticides, chlorpyrifos combines contact knockdown with stomach ingestion toxicity and a localized fumigant vapor action that penetrates soil crevices.
- Tri-Action Activity: Contact, stomach, and vapor fumigant action reaching concealed pests
- AChE Inhibition: Blocks nerve neurotransmitter breakdown, inducing hyper-excitation and pest mortality
- Soil Adsorption: Binds tightly to soil organic matter, creating an effective subterranean chemical barrier against subterranean termites
Major Crop Indications and Termite Protection
Chlorpyrifos 50% EC is registered for field crops, plantation agriculture, and non-crop pre-construction termite proofing.
In sugarcane, applying it directly into the furrow over seed setts protects developing eye buds from destructive subterranean termites.
- Sugarcane: Subterranean termite and root grub control via direct furrow drenching over planting setts
- Paddy & Cereals: Yellow stem borer, gall midge, and whorl maggot suppression
- Cotton: American bollworm, spotted bollworm, and whitefly nymph complexes
- Fruit Orchards: Trunk banding and soil drenching for subterranean termites and bark-eating caterpillars
Application Standards and Regulatory Safety
Because high-strength organophosphates carry environmental and mammalian toxicity risks, strict application safeguards must be maintained.
Wear protective personal equipment and strictly observe statutory pre-harvest intervals to ensure harvested food crops remain safe.
- Soil Furrow Drenching: Dilute in sufficient water and spray directly over sugarcane setts before covering with soil
- Protective Equipment: Wear rubber gloves, safety goggles, and respiratory masks during dilution and spraying
- Pollinator Safeguards: Highly toxic to bees; avoid spraying during active daylight honeybee foraging hours
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is chlorpyrifos 50% EC used for in agriculture?
It is used for soil furrow application to protect crops from subterranean termites and root grubs, and foliar spraying for borers and caterpillars.
How does chlorpyrifos act as a vapor fumigant?
It has a mild vapor phase that diffuses through soil air spaces and dense foliage crevices, reaching pests concealed in soil cracks or rolled leaves.
Is chlorpyrifos 50% EC safe for domestic vegetable gardens?
No, 50% EC is a concentrated agricultural and structural formulation; domestic gardens should use milder organic alternatives or lower-dose registered formulations.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
More Crop Protection & Pesticides guides
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