Deltamethrin 11% EC : Fast-Acting Pyrethroid Insecticide for Crop Pest Control

Deltamethrin 11% EC is a synthetic pyrethroid insecticide in emulsifiable concentrate form. It controls sucking pests, chewing insects, and boring pests in cotton, paddy, chilli, tomato, brinjal, okra, pulses, and oilseeds. It acts through contact and stomach action, delivering fast knockdown of active pest populations within hours of spraying.

The 11% EC formulation provides higher active ingredient concentration per litre compared to standard 2.5% and 2.8% deltamethrin formulations, meaning lower product volume per acre with equivalent or stronger pest control.

Target Pests & Registered Crops

Deltamethrin 11% EC Dosage & Application Rate

Water volume: 200 litres per acre for foliar spray. Mixing tip: Add EC formulation to half-filled sprayer tank, agitate well, then fill to full volume. Repeat interval: Every 10–15 days based on pest pressure. Maximum sprays per season: 2–3  rotate with a different IRAC group after each cycle.

When & How to Spray

• Spray at the first sign of pest attack. Deltamethrin works fastest on young pest populations
• For bollworm in cotton, spray when egg laying starts or at first instar larval stage
• For stem borer in paddy  spray at tillering stage when dead hearts appear
• For leaf folder in paddy  spray at early leaf rolling stage before larvae mature
• Cover both sides of leaves and stem base for complete contact action
• Spray in early morning or evening  avoid peak heat above 35°C which reduces efficacy
• Do not spray during flowering  deltamethrin is highly toxic to bees
• Do not spray near ponds, rivers, or fish farms  highly toxic to aquatic organisms

Mode of Action : How Deltamethrin 11% EC Works

Deltamethrin is a Type II synthetic pyrethroid that acts on voltage-gated sodium channels in the insect nervous system. It binds to sodium channels and keeps them open, causing continuous nerve firing, convulsions, paralysis, and death. This mechanism produces rapid knockdown  pests stop feeding and fall within minutes to hours of contact.

Unlike systemic insecticides, deltamethrin works primarily through direct contact and ingestion. Thorough spray coverage is therefore critical for maximum efficacy. It has no systemic uptake into plant tissue  pests must contact the treated surface or ingest treated plant material to be controlled.

Frequently Asked Questions

What is the dose of Deltamethrin 11% EC per litre of water?

The dose is 0.5 ml of Deltamethrin 11% EC per litre of water. For per-acre application, use 100–150 ml in 200 litres of water.

Which pests does Deltamethrin 11% EC control?

It controls American bollworm, pink bollworm, stem borer, leaf folder, aphids, jassids, thrips, fruit borer, shoot borer, pod borer, and hairy caterpillar in cotton, paddy, chilli, tomato, brinjal, okra, pulses, and oilseeds.

What is the difference between Deltamethrin 11% EC and 2.5% SC?

Deltamethrin 11% EC has a much higher active ingredient concentration  11% vs 2.5%. This means you need a significantly lower product volume per acre with the 11% EC formulation for equivalent pest control. The EC form also provides faster initial knockdown due to the oil-based carrier.

How fast does Deltamethrin 11% EC work?

Contact knockdown starts within hours of spraying. Pests stop feeding almost immediately after contact with treated surfaces. Residual protection on the crop canopy lasts 7–10 days depending on rainfall and temperature.

Can Deltamethrin 11% EC be used for stem borer control in paddy?

Yes. Spray at 0.5 ml per litre (100–150 ml per acre) at the tillering stage when dead hearts first appear. Ensure spray reaches the base of tillers where stem borer larvae enter. Repeat after 14 days if infestation continues.

Can Deltamethrin 11% EC be used for bollworm control in cotton?

Yes. Apply at the first sign of bollworm egg laying or early instar larvae at 0.5 ml per litre. Stomach action kills larvae that feed on treated bolls and leaves. For heavy infestations, rotate with a diamide or organophosphate to prevent pyrethroid resistance.

What is the pre-harvest interval for Deltamethrin 11% EC?

Pre-harvest interval is 7 days for vegetables, 10 days for pulses, and 14 days for cotton and paddy. Do not harvest within this period after the last spray.

Which IRAC group is Deltamethrin and how to rotate?

Deltamethrin belongs to IRAC Group 3A (Pyrethroid). Rotate with Group 1A organophosphates, Group 4A neonicotinoids, or Group 28 diamides to prevent resistance buildup in pest populations.

Also Useful For Your Crop

• For caterpillar control with translaminar action  see Emaan Emamectin Benzoate 5% SG  fruit borer & caterpillar control
• For diamide-based bollworm & stem borer control  see Cargar Chlorantraniliprole 18.5% SC  long-residual diamide insecticide
• For pyrethroid + neonicotinoid combination  see Thioshield Thiamethoxam 12.6% + Lambda 9.5% ZC  sucking + chewing dual action
• For novaluron-based caterpillar IGR option see Novaluron 10% EC  IGR for caterpillar & larval stage control
• For lambda-cyhalothrin pyrethroid alternative  see Lambda Knight Lambda-Cyhalothrin 5% EC  pyrethroid for broad pest control
• For other deltamethrin formulations  see Del-25 Deltamethrin 2.5% SC and Del-28 Deltamethrin 2.8% EC
• For all cotton pest management  browse all cotton crop products
• Read: paddy stem borer  symptoms, treatment & best insecticide guide
• Read: leaf folder control in paddy during monsoon
• Read: pink bollworm control in cotton  spray guide