Active ingredient and multi-site mode of action
Captan (N-(trichloromethylthio)cyclohex-4-ene-1,2-dicarboximide) is a multi-site protectant classified under FRAC Group M04. It reacts with cellular thiol groups (such as glutathione and cysteine residues) in fungal enzymes, halting cellular respiration and spore germination. Fungi cannot easily develop resistance to this broad enzymatic inhibition.
- Active constituent: Captan 50% WP (wettable powder) and 75% WS (water dispersible seed dressing)
- Chemical group: Phthalimide (FRAC Group M04)
- Application flexibility: Registered for seed treatment, soil drenching, and preventive foliar spraying
Target crops and major fungal diseases
- Apple and pear: Apple scab (Venturia inaequalis) and black rot.
- Chili and vegetables: Damping-off in nursery seedlings, fruit rot, and anthracnose.
- Pulses and oilseeds: Collar rot, root rot, and seed decay (used as seed treatment).
- Potato: Early blight and seed tuber rot.
Application precautions and compatibility
Captan is strictly a preventive fungicide and must be applied before fungal infection penetrates plant tissues. Do not tank-mix Captan with alkaline materials like lime sulphur or oil-based dormant sprays, which cause severe leaf burn. Always wear protective masks, gloves, and follow CIBRC pre-harvest intervals.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the primary mode of action of Captan fungicide?
It acts as a multi-site contact protectant, disrupting fungal thiol enzymes and blocking cellular energy production.
How is Captan used for seed treatment?
It is coated onto seeds at label-recommended rates before sowing to protect germinating seedlings from damping-off and soil rot.
Can Captan be mixed with agricultural oils?
No, mixing Captan with horticultural oils can cause severe leaf injury (phytotoxicity); maintain a minimum 14-day gap between sprays.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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