Thiamethoxam 25% WG: Complete Guide to Uses, Dosage & Price (2026)
Thiamethoxam was designed to be the successor to Imidacloprid — it's essentially Imidacloprid that went to the gym. Same neonicotinoid family, but more potent at lower doses, with faster systemic movement and better performance at high temperatures. If you're still using first-generation neonicotinoids where Thiamethoxam is available, you're leaving efficacy on the table.
Thiamethoxam 25% WG (Water Dispersible Granule) is one of the most widely used systemic insecticides in India today, trusted across cotton, paddy, vegetables, and dozens of other crops for sucking pest control.
What is Thiamethoxam 25% WG?
Thiamethoxam is a second-generation neonicotinoid insecticide — a systemic molecule that is absorbed by roots and leaves and transported throughout the plant via the xylem. Insects feeding on any part of the plant ingest the active ingredient and die.
The "25% WG" formulation is a Water Dispersible Granule — easy to measure, no clogging of spray nozzles, and excellent flowability compared to wettable powders. It dissolves completely in the spray tank.
Key characteristics:
- Systemic and translaminar activity — protects both sprayed surfaces and untreated tissue
- Fast-acting: sucking pests typically stop feeding within 1–2 hours of contact
- Flexible application: foliar spray, soil drench, or seed treatment (as Cruiser)
- Effective at high temperatures — performs well in Indian summer conditions where some other insecticides degrade
How Does Thiamethoxam Work?
Thiamethoxam binds selectively to nicotinic acetylcholine receptors (nAChR) in the insect's central nervous system. This causes continuous nerve stimulation — the insect cannot stop firing nerve signals — leading to paralysis and death.
Crucially, it binds to insect nAChR receptors with much higher affinity than to mammalian receptors, which is why neonicotinoids have low mammalian toxicity at field doses.
Thiamethoxam has a slight advantage over first-generation Imidacloprid: it converts partially to Clothianidin inside the plant — another active neonicotinoid — effectively delivering two related but distinct molecules. This dual-molecule activity contributes to its higher potency at lower doses.
Pests Thiamethoxam 25% WG Controls
| Pest | Crops |
|---|---|
| Brown Plant Hopper (BPH), White Backed Plant Hopper (WBPH) | Paddy |
| Stem borer, Gall midge, Leaf folder | Paddy |
| Green Leafhopper (GLH) | Paddy |
| Aphids, Jassids, Whiteflies, Thrips | Cotton, chilli, tomato, okra |
| White grubs | Sugarcane, groundnut |
| Termites | Sugarcane, cotton |
| Mango hoppers | Mango |
| Mealy bugs | Cotton, grapes, citrus |
| Leaf miner | Tomato, capsicum |
| Scale insects | Citrus, mango |
Thiamethoxam 25% WG Dosage Chart
| Crop | Pest | Dose per acre | Dose per 15 L pump |
|---|---|---|---|
| Paddy | BPH, WBPH, stem borer, leaf folder | 40–60 g | 10–15 g |
| Cotton | Aphids, jassids, whiteflies, thrips | 40–60 g | 10–15 g |
| Tomato / Chilli | Aphids, whiteflies, thrips | 40–60 g | 10–15 g |
| Okra (bhindi) | Jassids, whiteflies, thrips | 40–60 g | 10–15 g |
| Mango | Mango hoppers, mealy bug | 40–80 g in 200 L | 10–20 g |
| Sugarcane | Termites, early shoot borer | 80–100 g (soil drench) | — |
| Paddy nursery | BPH, hoppers | 800 g/acre (soil drench) | — |
| General foliar | Sucking pests | 0.5 g/L water | 10–12 g per 15 L |
Note on the nursery drench: The paddy nursery soil drench at 800 g/acre is a preventive application that protects young seedlings from BPH and hoppers before transplanting. This is a registered use and is highly effective in endemic areas.
Application Tips
- Spray at first pest appearance. Thiamethoxam is curative at low pest pressure; at very high infestation levels (e.g., heavy BPH hopper burn), spray damage may already be extensive before the product can arrest it.
- For soil pests: drench around the root zone. Systemic uptake via roots is more consistent than foliar absorption for soil-dwelling pests.
- Rainfastness: 4 hours. Ensure a 4-hour dry window post-spray.
- Don't spray on flowering crops during bee activity hours. Neonicotinoids are toxic to bees. Spray in early morning or evening when flowering crops are involved.
- Resistance management: Rotate with non-neonicotinoid insecticides (Emamectin benzoate, Fipronil, Chlorpyrifos) after 2 consecutive sprays.
Thiamethoxam vs Imidacloprid: Which is Better?
Both are neonicotinoids targeting nAChR. The practical differences:
- Potency: Thiamethoxam is effective at slightly lower doses — 0.5 g/L vs Imidacloprid's typical 0.5–1 mL/L
- Heat stability: Thiamethoxam performs better in high summer temperatures
- Resistance: Where Imidacloprid resistance has developed (some BPH populations, cotton whitefly), switch to Thiamethoxam — it is not fully cross-resistant
- Price: Thiamethoxam 25% WG is typically slightly more expensive per unit, but lower dose requirements partly offset this
- Seed treatment: Thiamethoxam dominates the seed treatment market (Cruiser); Imidacloprid also used but Thiamethoxam is preferred for most crops
Thiamethoxam 25% WG Price in India (2026)
- 100 g: ₹199–₹280
- 250 g: ₹450–₹580
- 500 g: ₹850–₹1,050
Buy Thiamethoxam 25% WG on Farmkart at the best price with cash on delivery across India.
Frequently Asked Questions
Q: Can I use Thiamethoxam 25% WG for seed treatment?
A: Yes — Thiamethoxam is registered for seed treatment in paddy, cotton, maize, sunflower, and several vegetable crops. The commercial seed treatment product is Cruiser (Syngenta). For farm-level seed treatment, use at 3–5 g/kg of seed.
Q: Is Thiamethoxam safe for silkworm cultivation areas?
A: No — Thiamethoxam and all neonicotinoids are toxic to silkworms. Do not spray near mulberry plants or silkworm rearing houses.
Q: What is the pre-harvest interval?
A: Varies by crop — typically 7–14 days for vegetables, 14 days for paddy. Check the product label.
Q: Is Thiamethoxam banned in India?
A: No — Thiamethoxam is approved for agricultural use in India. Some countries have restricted outdoor use on certain crops due to bee toxicity concerns, but it remains fully registered in India.
