Active ingredients and synergistic mode of action
The formulation works through complementary neurological pathways. Chlorpyrifos inhibits the acetylcholinesterase enzyme, causing acetylcholine accumulation in nerve synapses. Cypermethrin keeps nerve membrane sodium channels continuously open. This dual neurotoxic action delivers rapid knockdown, strong repellent action, and fumigant vapor activity.
- Chlorpyrifos (50% EC): Organophosphate with contact, ingestion, and respiratory vapor action.
- Cypermethrin (5% EC): Synthetic pyrethroid delivering quick paralytic knockdown upon pest contact.
- Synergistic formulation: Enhanced efficacy against pest populations showing tolerance to single-component sprays.
Target crops and major insect complexes
- Cotton: American bollworm (Helicoverpa armigera), spotted bollworm, and whitefly complexes.
- Soybean and pulses: Semiloopers, leaf miners, and pod borers.
- Paddy (rice): Stem borers and leaf folders.
- Vegetables: Fruit and shoot borer in brinjal and fruit borer in tomato.
Safe handling and statutory precautions
Organophosphates require strict safety precautions. Wear complete personal protective equipment including rubber gloves, face shields, and respirators during tank mixing and spraying. Never spray against the wind or near fish ponds and water streams. Always observe the CIBRC registered pre-harvest interval before picking crops.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What are the active ingredients in Hamla 550?
Hamla 550 contains Chlorpyrifos 50% and Cypermethrin 5% in an emulsifiable concentrate (EC) formulation.
Does Hamla 550 exhibit vapor action?
Yes, its chlorpyrifos component has fumigant vapor action that penetrates thick leaf folds to reach hidden borer larvae.
Why is protective gear essential when handling Hamla?
It contains an organophosphate neurotoxin that can be absorbed through skin and inhalation, requiring gloves and masks.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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