Active Components and Synergistic Action
Hamla 550 unites an organophosphate (chlorpyrifos) with a synthetic pyrethroid (cypermethrin). This dual chemistry creates a synergistic effect that knocks down pests faster than either molecule alone.
Chlorpyrifos acts as an acetylcholinesterase inhibitor, while cypermethrin keeps nerve sodium channels open, overwhelming the pest nervous system.
- Chlorpyrifos 50%: Delivers deep vapor penetration into dense plant canopies and soil cracks
- Cypermethrin 5%: Provides instantaneous knockdown on contact with exposed insects
- Synergism: Overcomes single-molecule metabolic resistance in stubborn caterpillar populations
Key Crop Uses and Target Pests
Hamla 550 is registered across major broad-acre and cash crops facing simultaneous caterpillar and sucking insect pressure.
In cotton, it tackles the bollworm complex while suppressing foliar aphids, thrips, and leafhoppers.
- Cotton: American bollworm, spotted bollworm, pink bollworm, and whitefly
- Paddy: Yellow stem borer, leaf folder, and gall midge
- Vegetables: Shoot and fruit borer in brinjal, fruit borer in tomato, and diamondback moth
Handling Precautions and Regulatory Standards
Because Hamla 550 contains high-strength chlorpyrifos, applicators must follow strict chemical safety protocols.
Avoid spraying during flower bloom to safeguard honeybees, and never allow wash water to contaminate rural ponds or cattle drinking troughs.
- Operator Safety: Wear rubber gloves, safety goggles, and respiratory masks during dilution and spraying
- Pre-Harvest Interval: Adhere to statutory withholding periods specified on the product label
- Storage: Keep locked in original containers away from household quarters, grain stores, and animal fodder
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 is the technical ratio in Hamla 550?
Hamla 550 contains chlorpyrifos 50% plus cypermethrin 5% EC in an emulsifiable concentrate formulation.
Can Hamla 550 penetrate dense plant canopies?
Yes, chlorpyrifos generates a mild fumigant vapor action that reaches caterpillars concealed within curled leaves and thick foliage.
Is Hamla 550 safe for honeybees?
No, both chlorpyrifos and cypermethrin are toxic to pollinators; avoid applying during active daylight bee foraging.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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