Optra Insecticide (Thiamethoxam 25% WG)
The Ultimate Systemic Solution for Sucking Pests and Plant Vigor
Optra (Thiamethoxam 25% WG) is a broad-spectrum systemic insecticide by Coromandel International (Gromor). It is the go-to solution for Indian farmers battling tough sucking pests like the Brown Plant Hopper (BPH) in rice and Whiteflies in cotton.
Why Choose This Product? Key Benefits
-
⏱️
Rapid Knockdown Action: Stops insects from feeding immediately after contact, preventing further crop damage.
-
🛡️
Systemic Protection: It is absorbed by the plant and moves upwards, protecting even the new leaves that grow after spraying.
-
⏳
Long-Lasting Control: Provides extended protection for up to 21 days against targeted pests.
-
🌧️
Excellent Rainfastness: Quickly penetrates the leaf surface, making it effective even if it rains 2-4 hours after application.
-
🌿
Crop Vigor Effect: Stimulates plants to withstand stress (like drought) and encourages greener foliage and better root growth.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Optra |
| Technical Name | Thiamethoxam 25% WG |
| IRAC MoA Code | Group 4A (Nicotinic Acetylcholine Receptor Agonist) |
| Chemical Group | Neonicotinoid (Thianicotinyl subclass) |
| Formulation | WG (Water Dispersible Granules) |
| Toxicity Label | Blue Triangle (Moderately Toxic) |
How It Works: Mode of Action
Optra targets the nervous system of the insect. Once ingested or contacted:
- Nerve Overload: It binds to receptors in the insect's brain, mimicking natural neurotransmitters.
- Feeding Stops: The insect's nervous system becomes hyper-excited, causing tremors and an immediate stop to feeding.
- Elimination: The pest eventually becomes paralyzed and dies due to energy exhaustion.
Because the chemical moves through the plant's water system (xylem), it reaches pests hiding under leaves or at the base of the stem.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Rice (Paddy) | Brown Plant Hopper (BPH), WBPH, Green Leaf Hopper (GLH), Stem Borer |
| Cotton | Whiteflies, Jassids, Aphids, Thrips |
| Vegetables (Okra, Tomato) | Whiteflies, Aphids, Jassids |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" for accurate results.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (g / Acre) | Water (L / Acre) | Dose (g / Litre) | PHI (Days) |
|---|---|---|---|---|
| Rice (Paddy) | 40g | 200 L | 0.2g | 14 Days |
| Cotton | 40g - 80g* | 200 L | 0.2g - 0.4g | 21 Days |
| Okra / Vegetables | 40g - 80g | 200 L | 0.2g - 0.4g | 5 Days |
*Use 80g/acre specifically for heavy Whitefly infestations. PHI = Pre-Harvest Interval (Days to wait before harvesting).
How to Apply: Best Practices
- Timing: Apply when you first see pest populations reaching the threshold (e.g., 5-10 hoppers per hill).
- Mixing: Dissolve the granules in a small mug of water to make a slurry before adding it to the main tank.
- Coverage: Ensure the spray reaches the stem base (for Hoppers) and undersides of leaves (for Whiteflies).
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. Does Optra control Brown Plant Hopper (BPH)?
Yes, it is highly effective against BPH, White Backed Plant Hopper, and Green Leaf Hopper in paddy.
2. Can I use this for Whiteflies in Cotton?
Yes, Optra is excellent for Whitefly control. For severe infestations, the recommended dose is 80g per acre.
3. What is the "Vigor Effect"?
Apart from killing pests, Thiamethoxam helps crops withstand stress and improves root growth, leading to greener, healthier plants.
4. Is it safe for honey bees?
No, it is toxic to bees. Avoid spraying during active flowering or when bees are foraging (morning/afternoon).
5. What is the rainfastness of Optra?
Optra is rainfast within 2 to 4 hours of application.
Safety & Disclaimer
Always read and follow the instructions on the official product label. The information provided here is for guidance only. Use personal protective equipment (PPE) during application.
