Active ingredient and physiological mode of action
Synthetic auxins regulate the cellular abscission zone in plant stems.
Mode of action details:
- Active ingredient: Alpha Naphthyl Acetic Acid (NAA) 4.5% SL (Soluble Liquid).
- Auxin balance: Delays the formation of the abscission layer at the pedicel joint, preventing premature drop of flower buds and young fruitlets.
- Cellular elongation: Stimulates cell division and tissue expansion, contributing to uniform fruit development.
- Dose sensitivity: Highly potent at very low parts-per-million (ppm) concentrations; excessive concentrations can cause adverse phytotoxicity or fruit thinning.
Approved crops and target benefits
NAA is approved across several commercial fruit and vegetable crops.
Key registered applications:
- Chilli: Prevents flower shedding and enhances pod retention during dry, windy weather spells.
- Cotton: Reduces square (flower bud) and immature boll drop, improving final harvest boll counts.
- Tomato and brinjal: Enhances flower set and prevents blossom drop caused by temperature fluctuations.
- Mango and citrus: Controls pre-harvest fruit drop, ensuring fruits reach full commercial maturity.
- Adhere strictly to label directions regarding dilution (typically 1 ml in 4 to 5 litres of water for standard 20-25 ppm solutions).
Application timing and spraying precautions
Apply as a fine foliar mist during early morning or late afternoon when temperatures are mild and stomata are open. Never mix NAA with highly alkaline sprays or strong chemical pesticides unless compatibility is proven. Wash spray equipment thoroughly after application.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the active ingredient in Planofix?
The active ingredient is Alpha Naphthyl Acetic Acid (NAA) 4.5% SL, a synthetic auxin plant growth regulator.
How does Planofix prevent flower and fruit drop?
It inhibits the formation of the abscission layer in flower and fruit stalks, keeping flowers and fruitlets firmly attached to the plant.
Why is exact dilution critical when spraying NAA?
Auxins are biologically active at minute ppm levels; using higher than recommended concentrations can cause leaf scorching, fruit thinning, or growth distortion.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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