Dual mode of action and pest spectrum
Hamla 550 provides synergistic insecticidal control through dual chemical pathways targeting the insect nervous system.
- Chlorpyrifos: Inhibits acetylcholinesterase (AChE) enzyme, disrupting neurotransmission across synaptic junctions.
- Cypermethrin: Keeps sodium channels open in nerve membranes, leading to rapid paralysis and knockdown.
- Target pests: Spotted bollworm, American bollworm, pink bollworm, and whitefly in cotton; pod borers in pigeon pea and pulses; stem borers in field crops.
Field application and label guidelines
Formulated as an emulsifiable concentrate (EC), Hamla 550 requires careful dilution and calibrated equipment.
- Apply when pest populations cross established economic injury levels.
- Ensure uniform coverage across the crop canopy, focusing on flowers, buds, and under-leaf foliage where pests harbor.
- Do not mix with alkaline substances such as lime sulfur or Bordeaux mixture which degrade active ingredients.
- Follow the pre-harvest interval (PHI) marked on the approved container label.
Worker safety and environmental precautions
Due to organophosphate toxicity, operators must exercise rigorous personal safety when handling and spraying Hamla 550.
- Use rubber gloves, apron, protective footwear, and a respirator during mixing and spraying.
- Avoid spraying near water bodies, ponds, and apiaries, as the mixture is toxic to aquatic organisms and honeybees.
- Keep atropine sulfate accessible as an antidote for organophosphate exposure under medical guidance.
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 (CIBRC) ↗Related on KisanPe
Common questions
What are the chemical contents of Hamla 550?
Hamla 550 contains Chlorpyrifos 50% and Cypermethrin 5% formulated as an Emulsifiable Concentrate (EC).
Does Hamla 550 work as a soil insecticide?
While Chlorpyrifos alone is used in soil, Hamla 550 combination is primarily labeled for foliar spraying against foliar borers and sucking pests.
Is Hamla 550 safe for honeybees?
No, both Chlorpyrifos and Cypermethrin are toxic to honeybees; avoid spraying during active foraging hours and bloom periods.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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