Chemical Class and Sodium Channel Blocker Action
Indoxacarb belongs to the oxadiazine chemical family (IRAC Group 22A - Voltage-dependent sodium channel blockers). It operates as a pro-insecticide that requires bio-activation inside the insect's digestive tract.
Insect esterases and amidases metabolize Indoxacarb into its decarbomethoxyllated metabolite (DCJW). DCJW binds tightly to voltage-gated sodium channels in nerve axons, blocking sodium ion entry. This causes rapid feeding cessation within 2 to 4 hours, followed by paralysis and death within 24 to 48 hours.
- IRAC Group 22A Mode of Action: Bio-activated nerve sodium channel blockade halting insect impulses.
- Rapid Feeding Cessation: Caterpillar feeding stops within hours, preventing further crop tissue injury.
- Zero Cross-Resistance: Completely effective against insect populations resistant to pyrethroids and organophosphates.
Target Caterpillar Pests and Labeled Crops
Indoxacarb is registered under CIBRC standards for managing destructive caterpillar pests in cotton, tomato, cabbage, chilli, and pigeon pea. In cotton, it manages American bollworm (Helicoverpa armigera) and spotted bollworm.
In vegetables, it controls tomato fruit borer, diamondback moth (Plutella xylostella) in cabbage and cauliflower, and pod borers in pigeon pea and chickpea, protecting developing pods and market fruits.
- Cotton Bollworms: Rapid control of American and spotted bollworm larvae.
- Vegetable Fruit Borers: Prevents internal larval boring in developing tomato and chilli fruits.
- Diamondback Moth (DBM): Controls pyrethroid-resistant DBM caterpillars in cole crops.
Application Guidelines and Resistance Stewardship
Apply Indoxacarb at early egg hatch or during early larval instars before caterpillars bore inside fruits, pods, or bolls. Ensure thorough foliar coverage using calibrated hollow cone nozzles on knapsack sprayers.
To prevent resistance development, rotate Indoxacarb with insecticides possessing distinct modes of action (such as diamides, spinosyns, or avermectins) within the crop growing season.
- Optimal Timing: Spray at early larval emergence for maximum contact and stomach ingestion.
- Rainfast Property: Absorbed into leaf waxes, offering good rainfastness once spray deposits dry.
- Pre-Harvest Interval (PHI): Observe recommended harvest waiting windows as prescribed on the product label.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What chemical class does Indoxacarb belong to?
Indoxacarb belongs to the oxadiazine chemical class (IRAC Group 22A).
Why is Indoxacarb called a pro-insecticide?
It must be bio-activated inside the insect's gut by metabolic enzymes into its active toxic form (DCJW) to block nerve sodium channels.
Which major pests are controlled by Indoxacarb?
It controls lepidopteran caterpillar pests including American bollworm, tomato fruit borer, diamondback moth, and pulse pod borers.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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