Chemical active ingredients and dual mode of action
- Chlorpyrifos (50%): An organophosphate that inhibits acetylcholinesterase in insect synapses, causing continuous nerve impulses and paralysis; provides strong vapor action penetrating dense foliage.
- Cypermethrin (5%): A synthetic pyrethroid that disrupts sodium channels in nerve axons, delivering rapid knockdown action upon direct contact.
- Synergistic performance: Combining both active ingredients delays resistance development and controls mixed pest populations in a single spray.
Approved target crops and insect pests
Registered under CIBRC label directions for managing American bollworm, Spotted bollworm, Pink bollworm, and Spodoptera litura in cotton; stem borer and leaf folder in paddy; and pod borers in pigeonpea and chickpea. It is also utilized for soil treatment against subterranean termites in non-crop and timber applications.
Safe spraying protocols and Pre-Harvest Intervals
- Apply at recommended label dosages per acre; dilute thoroughly in 150 to 200 liters of water per acre using a knapsack or power sprayer.
- Wear full personal protective equipment (PPE) including chemical-resistant gloves, a respirator mask, and protective goggles.
- Observe the mandatory Pre-Harvest Interval (PHI) printed on the container label before harvest.
- Avoid spraying during peak daytime hours to protect honeybees and predatory beneficial insects.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Directorate of Plant Protection, Quarantine & Storage (CIBRC) ↗Related on KisanPe
Common questions
What is the chemical composition of Hamla 550 insecticide?
Hamla 550 contains Chlorpyrifos 50% + Cypermethrin 5% formulated as an Emulsifiable Concentrate (EC).
What is the primary benefit of combining Chlorpyrifos and Cypermethrin?
Cypermethrin delivers immediate knockdown while Chlorpyrifos provides residual stomach action and vapor action to penetrate dense canopies.
Where can farmers check approved label claims for Hamla 550?
On the official portal of the Directorate of Plant Protection, Quarantine & Storage (ppqs.gov.in).
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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