Phthalimide Multi-Site Chemistry and Disease Spectrum
Captan (FRAC Group M04) functions as a non-specific multi-site inhibitor of fungal respiration and cellular thiol enzymes. Because it simultaneously attacks multiple biological pathways within fungal spores, pathogens cannot easily mutate to develop chemical resistance.
It serves as a reliable cornerstone in disease management programs when rotated with single-site systemic fungicides.
- Apple: Apple scab (Venturia inaequalis) and bitter rot.
- Vegetables: Early blight, damping off, and anthracnose in tomatoes and chillies.
- Potato: Early blight and late blight protection.
- Seed dressing: Protects germinating crop seeds against damping off and root rot complexes.
- Skin finish: Applications on pome fruits produce clean, glossy fruit skins with minimal russeting.
Application Protocols and Preventative Best Practices
Because Captaf is a contact protectant, it must be present on leaf and fruit surfaces before fungal spores land and germinate.
Ensuring uniform canopy coverage creates a protective shield that resists initial pathogen infection.
- Apply preventatively during cool morning hours before anticipated rainfall or disease-favorable weather.
- Seed treatment: Mix recommended dry powder per kilogram of certified seed to sanitize seed surfaces before sowing.
- Do not mix with alkaline substances such as lime sulfur or Bordeaux mixture to avoid rapid chemical hydrolysis.
- Wear personal protective gear including gloves, goggles, and dust mask during measuring and spraying.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active ingredient in Captaf fungicide?
Captaf contains Captan 50% WP, a broad-spectrum contact protectant fungicide of the phthalimide group.
Why is Captaf widely used in apple orchards?
It provides superior control against apple scab (Venturia inaequalis) while promoting excellent fruit skin finish without russeting.
Can Captaf be used for seed treatment?
Yes, it is widely utilized for dry or slurry seed dressing in cereals, pulses, and vegetables to prevent seedling damping off and collar rot.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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