Dual Active Chemistry and Synergistic Mode of Action
Chlorpyrifos belongs to the organophosphate class (IRAC Group 1B - Acetylcholinesterase inhibitors), which blocks the breakdown of acetylcholine in nerve synapses, causing continuous nerve firing and spasms. It also generates vapor action that penetrates dense leaf whorls and soil cracks.
Cypermethrin belongs to the synthetic pyrethroid group (IRAC Group 3A - Sodium channel modulators), which delays the closing of sodium channels in nerve axons, delivering instantaneous contact knockdown. Together, they create a synergistic punch that overcomes pest resistance to individual chemicals.
- Synergistic Knockdown: Cypermethrin provides instant knockdown while Chlorpyrifos delivers deep, long-lasting mortality.
- Fumigant Vapor Action: Penetrates dense crop canopies and borer entry holes where contact sprays cannot reach.
- Emulsifiable Concentrate (50% + 5% EC): Mixes easily in water to form a uniform milky foliar emulsion.
Target Pests and Labeled Field Crops
Chlorpyrifos 50% + Cypermethrin 5% EC is officially registered under CIBRC standards for controlling mixed insect infestations in cotton and field crops. In cotton, it manages the destructive bollworm complex (American, spotted, and pink bollworms) alongside aphids, jassids, and whiteflies.
In rice, it suppresses stem borers and leaf folders; in pulses, it controls pod borers; and in sugarcane, it provides protection against early shoot borers and termites.
- Cotton Bollworm Complex: Simultaneous knockdown of American, spotted, and pink bollworms.
- Paddy & Pulse Defense: Controls leaf folders, case worms, and pod borer caterpillars.
- Sucking Pest Suppression: Reduces nymphal and adult populations of aphids, jassids, and thrips.
Field Application Guidelines and Safety Stewardship
Apply the insecticide at the early emergence of caterpillars or when sucking pests exceed economic threshold levels. Ensure thorough spray coverage using calibrated hollow cone nozzles on knapsack or motorized sprayers.
Operators must follow mandatory personal safety protocols, including wearing protective respirators, goggles, chemical-resistant gloves, and protective clothing. Avoid spraying during midday heat to prevent chemical degradation.
- Optimal Timing: Spray during early morning or late evening when pests are active on foliage.
- Personal Protection: Wear full protective gear to avoid skin contact or vapor inhalation.
- Pre-Harvest Interval (PHI): Observe statutory harvest waiting intervals indicated on the registered product packaging.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the technical ratio in Chlorpyrifos + Cypermethrin combination?
The standard formulation contains Chlorpyrifos 50% + Cypermethrin 5% EC (Emulsifiable Concentrate).
How does the combination overcome insect resistance?
It attacks two distinct sites in the insect nervous system simultaneously (acetylcholinesterase and sodium channels), delivering synergistic toxicity.
Which major pests does this combination control in cotton?
It controls the entire cotton bollworm complex (American, spotted, pink bollworms) as well as sucking pests like aphids, jassids, and whiteflies.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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