Flubendiamide 20% WG Insecticide Uses

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    Flubendiamide 20% WG is a diamide-group insecticide (phthalic acid diamide) registered for use in India under the Insecticides Act, 1968, formulated as water-dispersible granules (WG) for foliar spraying. It acts specifically on caterpillars (lepidopteran larvae) and is registered for stem borer and leaf folder in paddy, American bollworm in cotton, pod borer in pigeon pea and Bengal gram, diamondback moth in cabbage, fruit borer in tomato and chilli, semilooper in tea, Spodoptera litura and semilooper in soybean, groundnut and blackgram (with Maruca pod borer), early shoot borer in sugarcane and fall armyworm in maize. This page lists its mode of action, key benefits and the recommended dosage as per the Central Insecticides Board & Registration Committee (CIB&RC) official list of approved insecticide uses (Government of India).

    Which Problem Is This For? (Symptom Guide)

    Not sure whether the damage in your field matches this insecticide's use case? This guide helps match what you see in the field to this insecticide's approved crop-wise uses.

    Crop Other Names What You'll See in the Field
    Rice (Paddy) — Stem borer तना छेदक (Tana Chhedak) At the vegetative stage the central shoot dries up and turns brown ("dead heart") and pulls out easily; at the earhead stage whole panicles turn white and empty ("white ear"/"white head"). Small entry holes may be seen on the stem.
    Rice (Paddy) — Leaf folder पत्ती लपेटक (Patti Lapetak) Leaves folded lengthwise and tied with silk threads; inside the fold the green tissue is scraped off by the larva, leaving long white, papery streaks. Heavily attacked fields look whitish from a distance.
    Cotton — American bollworm अमेरिकन सुंडी (American Sundi) Squares, flowers and young bolls with round bore holes, often with a green-to-brown striped caterpillar feeding with its head inside the boll; damaged squares and small bolls fall off, and holes are surrounded by droppings.
    Pigeon pea (Tur/Arhar) — Pod borer फली छेदक (Phali Chhedak) Round bore holes in the pods, often with the rear half of a green-to-brown caterpillar hanging outside while it feeds on the seeds inside; young larvae also feed on leaves, flowers and buds. Damaged pods are empty or have partly eaten seeds.
    Bengal gram (Chana) — Pod borer चने की सुंडी (Chane ki Sundi), फली छेदक Round bore holes in the pods, often with the rear half of a green-to-brown caterpillar hanging outside while it feeds on the seeds inside; young larvae also feed on leaves, flowers and buds. Damaged pods are empty or have partly eaten seeds.
    Cabbage — Diamondback moth हीरक पृष्ठ पतंगा (Heerak Prishth Patanga), डायमंड बैक मॉथ Small, pale green larvae that wriggle backwards and drop on a silk thread when disturbed. They scrape the underside of leaves, leaving papery "windows" that later become holes; in heavy attack the leaves are riddled with holes and the developing head is damaged and fouled with droppings.
    Tomato / Chilli — Fruit borer फल छेदक (Phal Chhedak) Round bore holes in the fruits, often with the rear half of a green-to-brown caterpillar outside while its head is inside; damaged fruits rot and drop. Young larvae also feed on leaves, flowers and buds.
    Tea — Semilooper सेमीलूपर / लूपर सुंडी (Looper Sundi) Green caterpillars that move by arching the middle of the body into a loop ("looper"); they eat irregular holes in the leaves, starting from the margins, and can defoliate plants in heavy attack.
    Soybean — Spodoptera litura, Semilooper तंबाकू की इल्ली (Tambaku ki Illi), हरी अर्धकुंडलक इल्ली (सेमीलूपर) Young caterpillars feed in groups on the underside of leaves, scraping the green tissue so that leaves look papery and net-like; older, dark-coloured caterpillars with black spots hide in the soil or plant base by day and eat large irregular holes in the leaves at night, sometimes leaving only the veins. Semilooper: green caterpillars that move by arching the middle of the body into a loop ("looper"); they eat irregular holes in the leaves, starting from the margins, and can defoliate plants in heavy attack.
    Groundnut — Tobacco caterpillar (Spodoptera litura) तंबाकू की इल्ली (Tambaku ki Illi) Young caterpillars feed in groups on the underside of leaves, scraping the green tissue so that leaves look papery and net-like; older, dark-coloured caterpillars with black spots hide in the soil or plant base by day and eat large irregular holes in the leaves at night, sometimes leaving only the veins.
    Blackgram (Urad) — Spodoptera litura, Maruca pod borer तंबाकू की इल्ली, चित्तीदार फली छेदक (Chittidar Phali Chhedak) Young caterpillars feed in groups on the underside of leaves, scraping the green tissue so that leaves look papery and net-like; older, dark-coloured caterpillars with black spots hide in the soil or plant base by day and eat large irregular holes in the leaves at night, sometimes leaving only the veins. Maruca: flowers, buds and pods webbed together with silk and droppings; a pale greenish larva with dark spots on its body feeds inside the webbed mass and bores into pods.
    Sugarcane — Early shoot borer अगेती तना छेदक (Ageti Tana Chhedak) In the young crop (about 1–3 months old) the central leaf whorl dries up ("dead heart") and pulls out easily, giving off a foul smell; small bore holes are seen on the shoot just above the soil.
    Maize — Fall armyworm फॉल आर्मीवर्म (Fall Armyworm), सैनिक कीट Ragged, irregular holes in the whorl leaves and windows scraped on young leaves; moist, sawdust-like droppings in the whorl. The caterpillar has a pale inverted "Y" mark on its head and four dark spots in a square on its last body segment.

    Mode of Action

    Flubendiamide is a diamide insecticide (IRAC Group 28 — ryanodine receptor modulators). It binds to the ryanodine receptors in the insect's muscle cells, causing uncontrolled release of stored calcium. The muscles contract continuously and lose function, so the caterpillar stops feeding within a short time, becomes paralysed and dies. It acts mainly through ingestion (stomach action) with some contact action, and has translaminar movement into the leaf. It is selective to caterpillars (Lepidoptera).

    Features & Benefits

    • Specific to caterpillars — stem borers, bollworms, pod and fruit borers, diamondback moth, Spodoptera, semiloopers and fall armyworm.
    • Rapid stop in feeding after exposure, which limits further crop damage.
    • Water-dispersible granules mix readily in water and are easy to measure.
    • Group 28 mode of action differs from organophosphates, pyrethroids and other older chemistries — useful in rotation for resistance management (avoid repeated back-to-back sprays of Group 28 diamides on the same pest generation).

    Recommended Usage of Flubendiamide 20% WG Insecticide

    The table below gives the recommended dose, water volume and waiting period per acre, converted from the CIB&RC-registered per-hectare rate — see the note below the table for conversion details. Always confirm against the current product label before use.

    Crop Target Pest Dose per Acre Water Volume per Acre Waiting Period (PHI)
    Rice (Paddy) Stem borer, Leaf folder ~50 g ~200 litres 30 days
    Cotton American bollworm ~100 g ~200 litres 30 days
    Pigeon pea (Tur/Arhar) Pod borer ~100 g ~200 litres 30 days
    Cabbage Diamondback moth ~25 g ~200 litres 7 days
    Tomato Fruit borer ~100 g ~200 litres 5 days
    Tea Semilooper ~60 g ~160 litres 7 days
    Chilli Fruit borer ~100–120 g ~200 litres 5 days
    Soybean Tobacco caterpillar (Spodoptera litura), Semilooper ~100–120 g ~200 litres 29 days
    Groundnut Tobacco caterpillar (Spodoptera litura) ~120 g ~200 litres 31 days
    Blackgram (Urad) Tobacco caterpillar (Spodoptera litura), Spotted pod borer (Maruca spp.) ~120 g ~200 litres 23 days
    Bengal gram (Chana) Pod borer ~100 g ~200 litres 15 days
    Sugarcane Early shoot borer ~150 g ~200–300 litres 204 days
    Maize Fall armyworm (Spodoptera frugiperda) ~100 g ~200 litres 55 days

    Figures above are converted from the CIB&RC-registered per-hectare rate (1 ha ≈ 2.47 acres): paddy 125 g/ha (25 g a.i.); cotton, pigeon pea, tomato, Bengal gram and maize 250 g/ha (50 g a.i.); cabbage 62.5 g/ha (12.5 g a.i.); tea 150 g/ha (30 g a.i.) in 400 L water/ha; chilli and soybean 250–300 g/ha (50–60 g a.i.); groundnut and blackgram 300 g/ha (60 g a.i.); sugarcane 375 g/ha (75 g a.i.) in 500–750 L water/ha. Water volume is 500 L/ha unless stated. Waiting periods are as listed by CIB&RC. Always confirm the current dose on your specific product's label before use.

    How to Use

    1. Identify the pest from the symptom guide above and confirm the dose for your crop from the table.
    2. Add the measured granules to a small quantity of water in a bucket and stir until fully dispersed, then pour into the spray tank and top up to the full volume while stirring.
    3. Spray uniformly over the crop with a knapsack or power sprayer, covering leaves, shoots, flowers and fruits/pods where the caterpillars feed; for fall armyworm in maize, direct the spray into the leaf whorl.
    4. Spray when young larvae or the first signs of damage are seen (dead hearts, bore holes, webbed or scraped leaves), or at the crop stage advised by your local agricultural extension office.
    5. Spray in calm weather in the early morning or late evening, and avoid spraying if rain is expected within a few hours.

    Precautions & Safety

    • Wear appropriate PPE — mask/respirator, gloves, goggles and full-sleeved clothing — while mixing and spraying, and avoid inhaling the spray mist.
    • Follow the recommended dose strictly; do not mix with other pesticides unless specifically recommended.
    • Respect the crop-wise waiting period (PHI) in the table before harvesting the treated crop — for example 5 days for tomato and chilli, 7 days for cabbage and tea, 30 days for paddy and cotton, and 204 days for sugarcane.
    • Do not apply Group 28 (diamide) insecticides more often than recommended on the same crop; rotate with insecticides of a different mode of action.
    • Do not let spray wash or field water reach ponds, fish tanks, streams or drinking-water sources.
    • 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 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.

    Disclaimer

    The dosage and usage information on this page is based on the Central Insecticides Board & Registration Committee (CIB&RC), Government of India, document "Major Uses of Pesticides" (registered under the Insecticides Act, 1968; updated up to 31.03.2026). As stated in that document, it has been compiled on the basis of available information for guidance and not for legal purposes. Likewise, this page is for general information and guidance only; it is not intended for any legal purpose and has no legal validity.

    Before using any product, always read and follow the instructions on its label and leaflet. If in doubt, consult your local agricultural extension officer.

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