IIL Prism Fungicide - Thiophanate Methyl 70% WP for Anthracnose, Scab & Powdery Mildew Control

IIL Prism is a broad-spectrum systemic fungicide from Insecticides India Limited (IIL) containing Thiophanate Methyl 70% WP (Wettable Powder). It belongs to the Benzimidazole group of fungicides and offers both protective and curative action against a wide range of fungal diseases. Prism is highly effective for controlling diseases like anthracnose, apple scab, powdery mildew, and various leaf spot diseases in crops such as papaya, apple, tomato, bottle gourd, and grapes.

Once applied, Prism is quickly absorbed by the plant and moves systemically through the vascular system. This means it protects not just the sprayed areas but also new growth that emerges after application. The fungicide works by stopping fungal cell division, which prevents the disease from spreading and eventually kills the fungus. With its dual preventive and curative action, Prism gives farmers a reliable tool for managing fungal infections throughout the crop cycle.

Prism can be used in multiple ways — as a foliar spray, seed treatment, soil drench, or rhizome/tuber dip — making it a versatile choice for different crops and farming practices. It is classified under the Green/Blue toxicity label (slightly to moderately toxic) and carries a Green Triangle toxicity mark, indicating relatively low toxicity when used as directed. However, it should not be mixed with copper-based fungicides or alkaline solutions. Prism is suitable for use in integrated crop protection programs and helps preserve both yield and fruit quality.

Key Benefits

• Dual action protection: Works as both a preventive shield (stops disease before it starts) and a curative treatment (stops existing infections from spreading).
• Systemic movement inside the plant: Gets absorbed by leaves and roots and travels upward through the plant, protecting new growth that was not directly sprayed.
• Long-lasting disease control: Stays active inside the plant tissue, offering extended protection compared to contact fungicides that can wash off easily.
• Rainfast in 2-4 hours: Quick absorption means your spray investment is safe even if rain occurs a few hours after application.
• Phytotonic greening effect: As Prism breaks down inside the plant, it releases sulfur and nitrogen that the crop can use, often making leaves look greener and healthier.
• Versatile application methods: Can be used as foliar spray, seed treatment, soil drench, or tuber/rhizome dip — suitable for different crop needs.
• Preserves fruit quality: Effective disease control helps maintain the overall quality of fruits, making it ideal for commercial crops.

How It Works

Prism acts as a "pro-drug" — meaning the active ingredient Thiophanate Methyl is not the final disease-killing compound itself. Once the fungicide is absorbed by the plant through leaves or roots, it converts inside the plant tissue into Carbendazim (also known as MBC - Methyl Benzimidazole Carbamate), which is the actual compound that kills the fungus.

This conversion happens naturally inside the plant. Once converted, Carbendazim binds to the tubulin proteins in the fungal cells. Tubulin proteins are essential for the fungus to divide and multiply. By binding to these proteins, Prism effectively stops cell division (mitosis) in the fungus. Without the ability to divide and grow, the fungal infection cannot spread to new plant tissue, and the existing infection eventually dies out.

Because Prism moves systemically through the plant's xylem (water-conducting tissue), it travels upward from the roots or sprayed leaves to protect new shoots and leaves that emerge after application. This systemic movement is what makes Prism effective even on parts of the plant that were not directly sprayed. The fungicide also prevents fungal spores from germinating on the plant surface, providing a protective barrier against new infections.

Technical Specifications

Parameter	Details
Brand Name	Prism (Insecticides India Ltd.)
Technical Content	Thiophanate Methyl 70% WP
Formulation	Wettable Powder (WP)
Chemical Group	Benzimidazole (Thiourea / Benzimidazole Precursor)
Mode of Action	Systemic – Protective & Curative
IRAC MoA Code	Group 1 (Benzimidazoles)
Toxicity Label	Green Triangle / Green-Blue (Slightly to Moderately Toxic)
Target Diseases	Anthracnose, Apple Scab, Powdery Mildew, Leaf Spot Diseases
Country of Origin	India

Recommended Dosage & Application

The standard dosage for Prism is 250 grams per acre for foliar spray, mixed in 150–200 litres of water. For other application methods, the dosage may vary. Always follow the "dose per acre" for accurate results, as water volume may change based on spray equipment and crop stage.

Crop	Target Diseases	Dosage (per acre)	Water Volume	PHI (Days)
Papaya	Anthracnose, Leaf Spot, Powdery Mildew	250–300 g	150–200 L	4–5 days
Apple	Apple Scab, Powdery Mildew	250–300 g	As per tree size	3 days
Tomato	Leaf Spot, Anthracnose, Ring Rot	250–300 g	150–200 L	—
Bottle Gourd	Leaf Spot, Powdery Mildew, Fruit Rot	250–300 g	150–200 L	1 day
Grapes	Powdery Mildew, Anthracnose, Rust	250–300 g	150–200 L	14 days

For other application methods:

• Seed treatment: 300 g per acre (or 2–3 g per kg of seed)
• Rhizome/Tuber dip: 300 g per acre (or 1–2 g per litre of water, soak for 30 minutes before planting)
• Soil drench: 300 g per acre (or 2–4 g per litre of water for nursery seedlings)

PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.

When to Use

Prism is most effective when used as a preventive measure — applied before disease symptoms appear, especially during periods when weather conditions favour fungal growth (high humidity, rainfall, or moderate temperatures). For best results, apply at the very first sign of disease infection.

For apples, apply at the pre-flowering stage to protect against apple scab and powdery mildew. For grapes, apply before fruit setting to control powdery mildew and anthracnose. On papaya and bottle gourd, apply during the vegetative to flowering stage when disease pressure is high. For tomatoes, apply during early growth stages to prevent leaf spot and anthracnose.

Avoid spraying if rain is expected within 2 hours of application. The product is rainfast within 2–4 hours after spraying due to quick absorption. To prevent the development of fungicide resistance, do not use Prism more than 2–3 times per season. Rotate with fungicides from different chemical groups (such as Mancozeb or Triazoles) for long-term effectiveness.

Step by Step Usage Instructions

1. Wear protective gear: Put on gloves, mask, and goggles before handling the product.
2. Prepare the mixture (creaming method): Since Prism is a Wettable Powder (WP), first mix the required amount of powder with a small amount of water in a separate container to make a smooth, lump-free paste.
3. Add to spray tank: Pour this paste into the spray tank filled with the required amount of clean water. Stir well to ensure even mixing.
4. Use proper nozzle: Use a hollow cone nozzle for a fine, uniform mist. Ensure full coverage of all plant parts, especially the undersides of leaves.
5. Apply at right time: Spray during cool hours — early morning or late evening. Avoid spraying in direct sunlight or when rain is expected within 2 hours.
6. Clean equipment: After spraying, thoroughly wash all spray equipment with clean water. Do not dispose of wash water in ponds, rivers, or water bodies.

Compatibility

Prism is compatible with most commonly used insecticides and plant growth regulators. However, it should NEVER be mixed with copper-based fungicides (such as Bordeaux mixture, Copper Oxychloride) or highly alkaline solutions (such as Lime Sulfur), as these can reduce the effectiveness of the fungicide. If mixing with other products for the first time, it is advisable to do a small jar test to check for any adverse reactions before large-scale application.

Precautions & Safety

• Personal protection: Always wear gloves, mask, and goggles while handling and spraying the product.
• Avoid contact: Do not let the product come in direct contact with skin, eyes, or mouth. In case of contact, wash thoroughly with plenty of clean water.
• During spraying: Do not eat, drink, or smoke while handling or applying the product. Wash hands and face thoroughly after spraying.
• Storage: Store in the original container in a cool, dry place away from direct sunlight. Keep out of reach of children and away from food, feed, and drinking water.
• Environmental safety: Prevent spray drift to nearby water bodies, ponds, or non-target crops. Do not wash spray equipment in water sources used for drinking or fishing.
• Do not exceed dosage: Always follow the recommended dosage. Overuse can lead to residue issues and fungicide resistance.

PHI / REI & Storage

Parameter	Details
Pre-Harvest Interval (PHI) - Papaya	4–5 days
Pre-Harvest Interval (PHI) - Apple	3 days
Pre-Harvest Interval (PHI) - Bottle Gourd	1 day
Pre-Harvest Interval (PHI) - Grapes	14 days
Re-Entry Interval (REI)	24 hours (wait before entering treated field)
Storage	Store in original container in a cool, dry place away from moisture and sunlight