Chemical properties and neurotoxic mode of action
Quinalphos belongs to the organophosphorus chemical group and exhibits rapid contact, stomach, and translaminar penetration into plant leaves.
It works by inhibiting acetylcholinesterase (AChE), an essential enzyme that breaks down the neurotransmitter acetylcholine at nerve synapses. This causes accumulation of acetylcholine, leading to continuous nerve excitation, paralysis, and death of target pests.
- Active chemical: Quinalphos 25% EC (emulsifiable concentrate).
- Mode of action: Acetylcholinesterase inhibitor delivering contact and stomach poison effects.
- Translaminar penetration: Penetrates foliar leaf tissues to control pests feeding on lower leaf surfaces and inside leaf folds.
Registered crops and target pest spectrum
Quinalphos 25% EC is registered for controlling a broad spectrum of insect pests across major food, fiber, and plantation crops.
It is widely recommended in integrated pest management programs for combating stem borers, caterpillars, and sucking pests.
- Paddy (Rice): Stem borer, leaf folder, whorl maggot, and gall midge.
- Cotton: Bollworm complex, leafhoppers, aphids, and thrips.
- Pulses (Pigeon pea, Bengal gram): Pod borer (Helicoverpa armigera) and pod fly.
- Oilseeds (Groundnut, Mustard): Leaf miner, spodoptera caterpillar, and sawfly.
Application timing, dilution, and safety directions
Apply Quinalphos 25% EC upon observing pest numbers crossing the economic threshold level (ETL), using clean water at container label recommended rates.
Because it is an organophosphate compound, operators must follow strict chemical safety precautions to prevent occupational exposure.
- Spraying practice: Ensure even foliar coverage; avoid spraying during windy weather or intense midday sun.
- Personal protective equipment: Wear rubber gloves, protective clothing, face shield, and chemical-resistant boots.
- Pre-harvest interval (PHI): Strictly observe the designated waiting period between final spray and harvest to avoid chemical residues in produce.
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 insect pests does Quinalphos 25% EC control?
It controls stem borers, leaf folders, bollworms, pod borers, aphids, thrips, and leaf miners across diverse agricultural crops.
How does Quinalphos work inside the insect body?
It inhibits the acetylcholinesterase enzyme, causing nervous system overstimulation, muscle paralysis, and death.
What safety gear is recommended during Quinalphos spraying?
Applicators should wear rubber gloves, a face shield or mask, protective goggles, and full-body clothing to prevent skin contact and vapor inhalation.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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