Quinalphos 25% EC Insecticide Uses

Quinalphos 25% EC is a broad-spectrum organophosphate insecticide, registered for use in India under the Insecticides Act, 1968, formulated as an emulsifiable concentrate (EC). It is registered for the control of brown plant hopper, hispa/blue beetle, leaf folder and stem borer in paddy (rice), and aphid in wheat. This page lists its mode of action, key benefits and the complete crop-wise recommended dosage as per the Central Insecticides Board & Registration Committee’s (CIB&RC) official list of approved insecticide uses.

Mode of Action

Quinalphos acts mainly by contact and stomach action, with some vapour-phase (fumigant) activity in the crop canopy. It inhibits the enzyme acetylcholinesterase in the pest’s nervous system, causing the neurotransmitter acetylcholine to accumulate at nerve junctions. This leads to continuous, uncontrolled nerve firing, tremors, paralysis and death of the target insect. Its ability to act through the vapour phase helps it reach hoppers and other pests sheltering deep in the crop canopy, such as at the base of paddy tillers.

Features & Benefits

• Broad-spectrum action covers both major sucking pests (brown plant hopper) and chewing/boring pests (hispa, leaf folder, stem borer) of paddy.
• Vapour-phase activity helps reach hoppers sheltering at the base of tillers, in addition to direct-contact and ingestion action.
• Well-established, cost-effective organophosphate chemistry widely used in paddy pest management.
• Also registered for aphid control in wheat, giving useful cross-crop utility.

Recommended Usage of Quinalphos 25% EC Insecticide

The table below gives the recommended dose per acre, converted from the official rate published in the Central Insecticides Board & Registration Committee’s (CIB&RC) list of approved insecticide uses (Government of India), which is expressed per hectare (1 ha ≈ 2.47 acres). Always spray in the recommended water volume for uniform coverage, and confirm against the current product label before use.

Doses above are converted from the official rate published in the CIB&RC’s list of approved insecticide uses (Government of India), which states the rate per hectare; converted here to a practical per-acre spray-tank quantity (1 ha ≈ 2.47 acres) and rounded. Always confirm the current dose on your specific product’s label, and consult your local agricultural extension office if in doubt.

How to Use

1. Identify your crop and target pest from the table above, and confirm the correct dose and water volume.
2. Measure the required quantity of Quinalphos 25% EC and add it to the spray tank half-filled with water, then top up while stirring, since this is an emulsifiable concentrate (EC) formulation.
3. Apply as a fine, uniform spray covering the entire crop canopy; for paddy hoppers, direct the spray toward the base of the plant where hoppers congregate, and drain excess standing water before spraying if possible.
4. Spray on crossing the economic threshold level for the target pest, based on regular field scouting.
5. Respect the long waiting period (40 days) on paddy and wheat given in the table, and rotate with insecticides from a different mode-of-action group to manage resistance.

Precautions & Safety

• Wear appropriate PPE — mask/respirator, gloves, goggles and full-sleeved clothing — while mixing and spraying, and avoid inhaling spray mist.
• Follow the recommended dose strictly; do not mix with other pesticides unless specifically recommended, and never spray during flowering when bees are foraging, as many insecticides are toxic to bees.
• Respect the waiting period (PHI) given in the table above and on the current product label before harvesting the treated crop.
• Spray during calm weather (early morning or late evening), avoiding rain within a few hours of application and high wind that causes spray drift.
• Store in the original, tightly closed container in a cool, dry place away from direct sunlight, food and feed, and out of reach of children and livestock.
• Wash hands, face and any exposed skin thoroughly with soap and water after handling or spraying, and change out of contaminated clothing before eating, drinking or smoking.

Brand names mentioned on this page are registered trademarks of their respective owners and are referenced here for identification purposes only; FarmMate is not affiliated with or endorsed by these brands. This page is for general information only — always consult your local agricultural extension office and confirm the current product label before use.