Imidacloprid 17.8% SL: Complete Guide for Indian Farmers (2026)
Imidacloprid is the Sachin Tendulkar of insecticides — still performing after 30 years in the Indian market, still the benchmark that every new sucking-pest product gets compared against. Introduced in 1994, it remains the world's highest-selling insecticide active ingredient. That's not inertia. That's a product that works reliably across diverse conditions, at reasonable cost, with a well-understood safety profile.
Imidacloprid 17.8% SL (Soluble Liquid) is the most widely available concentration for foliar and soil application in India. Here's the complete farmer's guide.
What is Imidacloprid 17.8% SL?
Imidacloprid is a first-generation neonicotinoid insecticide — a systemic molecule that is absorbed by the plant and transported via the xylem from roots to shoots. The "17.8% SL" formulation dissolves completely in water with no residue, making it one of the easiest insecticides to measure and mix.
Major brands in India include Confidor (Bayer), Tatamida (Tata Rallis), Media (Dhanuka), Gaucho (Bayer, seed treatment), and numerous generic formulations.
Key characteristics:
- Systemic with acropetal movement — absorbed by roots, moves upward to protect all above-ground tissue
- Translaminar activity — penetrates the leaf, protecting the underside from pests that are never directly sprayed
- Stomach and contact action
- Rapid initial activity: sucking pests typically stop feeding within 30–60 minutes of contact
How Does Imidacloprid Work?
Imidacloprid binds to nicotinic acetylcholine receptors (nAChR) in the insect's nervous system — the same receptor type targeted by nicotine. This mimics the acetylcholine signal that activates muscles, causing continuous, uncontrolled nerve stimulation. The insect is permanently "switched on" — unable to feed, move normally, or survive.
Imidacloprid binds to insect nAChR receptors with 7,000–10,000× greater affinity than to mammalian receptors, which explains why it has low toxicity to mammals at recommended doses while being highly toxic to insects.
The systemic and acropetal movement pattern means that even insects feeding on new growth — tissue that was never directly sprayed — encounter Imidacloprid absorbed from roots or older leaves. This is particularly valuable for persistent sucking pest pressure.
Pests Imidacloprid 17.8% SL Controls
| Pest | Crops |
|---|---|
| Aphids | Cotton, chilli, tomato, mustard, citrus, all vegetables |
| Whiteflies | Cotton, tomato, chilli, brinjal, cucurbits |
| Jassids (leafhoppers) | Cotton, chilli, brinjal, okra |
| Thrips | Chilli, onion, grapes, cucumber |
| Brown Plant Hopper (BPH) | Paddy |
| Mealy bugs | Cotton, grapes, citrus, pomegranate |
| Scale insects | Citrus, mango, coffee |
| Mango hoppers | Mango |
| Leaf miners | Tomato, capsicum, beans |
| Termites | Sugarcane (soil application) |
| Grubs (white grubs) | Groundnut, potato (soil drench) |
Imidacloprid 17.8% SL Dosage Chart
| Crop | Pest | Dose per acre | Dose per litre |
|---|---|---|---|
| Cotton | Aphids, jassids, whiteflies, thrips | 60–80 mL in 200 L water | 0.3–0.4 mL/L |
| Paddy | BPH, WBPH, GLH | 50–60 mL in 200 L water | 0.3 mL/L |
| Chilli / Tomato | Aphids, whiteflies, thrips | 60–80 mL in 200 L water | 0.3–0.5 mL/L |
| Okra / Brinjal | Jassids, whiteflies | 50–70 mL in 200 L water | 0.3–0.4 mL/L |
| Mango | Hoppers, mealy bug | 0.5 mL/L water (spray to run-off) | 0.5 mL/L |
| Citrus / Grapes | Scale insects, mealy bug, thrips | 0.5 mL/L water | 0.5 mL/L |
| Sugarcane | Termites, early shoot borer | 140–200 mL per acre (soil drench) | — |
| General foliar | Sucking pests | 0.5 mL/L water | 0.5 mL/L |
Application Tips: Getting Maximum Value from Imidacloprid
- Spray at first infestation — don't wait. Imidacloprid controls sucking pests before populations explode. By the time you see visible yellowing or leaf curl from heavy aphid or whitefly infestation, you're already losing yield.
- For soil pests: drench the root zone. Systemic uptake from soil gives 3–6 weeks of residual protection — far more cost-effective than repeated foliar sprays for root-feeding pests.
- Don't spray on flowering crops during bee activity hours. Imidacloprid is toxic to bees. Spray in the early morning before 8 AM or after 6 PM when the crop is flowering.
- Rainfastness: 2–4 hours. Imidacloprid is absorbed rapidly once it enters the leaf. Wait 4 hours post-spray before any irrigation or expected rainfall.
- Resistance management is critical. BPH resistance to Imidacloprid has been documented in several rice-growing states in India. Rotate with Fipronil, Buprofezin, or Ethiprole after 2 consecutive sprays.
When Imidacloprid Stops Working: Recognising Resistance
If you apply Imidacloprid at the correct dose and see no reduction in BPH or whitefly populations within 72 hours, resistance may have developed in that pest population. This is well-documented in:
- BPH in paddy (several districts in Karnataka, Andhra Pradesh, Tamil Nadu)
- Cotton whitefly (Bemisia tabaci) in Punjab and Haryana
If you suspect resistance: switch immediately to Fipronil (GABA receptor mechanism), Emamectin benzoate (avermectin), or Buprofezin (insect growth regulator). Do not increase the Imidacloprid dose — it won't work and wastes money.
Imidacloprid 17.8% SL Price in India (2026)
- 100 mL: ₹130–₹180
- 250 mL: ₹290–₹380
- 500 mL: ₹530–₹680
- 1 litre: ₹950–₹1,200
Imidacloprid is one of the most cost-effective systemic insecticides available — at 0.5 mL/L, a 500 mL bottle treats approximately 1,000 litres of spray solution. For a standard 200 L/acre foliar application, that's coverage for 5 acres.
Buy Imidacloprid 17.8% SL on Farmkart with cash on delivery across all major farming districts in India.
Frequently Asked Questions
Q: What is the difference between Imidacloprid 17.8 SL and Imidacloprid 70 WG?
A: Both contain Imidacloprid but at different concentrations. The 17.8% SL (liquid) is used for foliar and soil drench applications. The 70% WG (granule) is used primarily for seed treatment (Gaucho, Raxil). Different concentrations — adjust doses accordingly.
Q: Can I mix Imidacloprid with fungicides?
A: Yes — commonly tank-mixed with Mancozeb, Copper Oxychloride, or Propiconazole for combined pest and disease control. Avoid highly alkaline mixes. Always jar test.
Q: Pre-harvest interval?
A: Varies — 7 days for chilli, 7–14 days for most vegetables, 14 days for paddy. Check the label for your specific crop.
Q: Is Imidacloprid banned in India?
A: No — it is fully registered and legal for agricultural use in India. Some countries have placed restrictions on outdoor use due to bee toxicity concerns, but India's CIBRC registration remains in place.
Q: How many times can I spray per season?
A: Maximum 2 consecutive sprays per season. Rotate with a non-neonicotinoid insecticide for subsequent applications.
