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Crop Protection & Pesticides

Denitol Insecticide: Fenpropathrin Active, Pests, and Safe Use

Denitol is a broad-spectrum synthetic pyrethroid insecticide and acaricide containing Fenpropathrin 10% EC. It provides rapid knockdown and residual control against bollworms, whiteflies, and red spider mites across cotton, vegetables, and plantation crops.

Last reviewed: 10 November 2026

Insecticidal and Acaricidal Mode of Action

Fenpropathrin (IRAC Group 3A) keeps sodium channels open in insect nerve membranes, causing repetitive nerve discharges, rapid paralysis, and death. Uniquely among pyrethroids, it possesses potent acaricidal properties, providing dual control against both chewing insects and phytophagous mites.

Its contact activity provides quick knock-down of mobile adult and nymphal stages.

  • Cotton: Pink bollworm, spotted bollworm, whitefly (Bemisia tabaci), and two-spotted spider mites.
  • Vegetables: Fruit borers, leaf miners, and red spider mites in chilli, brinjal, and okra.
  • Rapid knockdown: Delivers immediate feeding cessation upon contact or ingestion.

Application Best Practices and Resistance Care

Denitol should be applied when scouting indicates pest populations approaching economic threshold levels (ETL).

Careful sprayer calibration ensures that lower leaf surfaces receive thorough wetting where mites nest.

  • Spray thoroughly covering the underside of leaves where whiteflies and spider mites colonize.
  • Rotate with non-pyrethroid chemistries (such as avermectins or spirotetramat) to prevent mite and insect resistance.
  • Observe pre-harvest withholding intervals and wear full personal protective clothing during spraying.

Official source

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Central Insecticides Board & Registration Committee ↗

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Common questions

What is the active ingredient in Denitol?

Denitol contains Fenpropathrin 10% EC, a synthetic pyrethroid possessing both insecticidal and acaricidal activity.

Can Denitol control both insects and mites together?

Yes, Fenpropathrin is effective against both chewing caterpillars/sucking insects and spider mite complexes.

What are the key crops for Denitol application?

It is registered primarily for cotton, vegetables (chilli, brinjal, okra), and tea per CIBRC approved label recommendations.

General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.

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