Physiological mode of action in fruit orchards
- Gibberellin biosynthesis inhibition: Blocks the conversion of ent-kaurene to ent-kaurenoic acid, reducing endogenous growth hormones that promote vegetative shoot flushes.
- Flowering synchronization: Channels carbohydrate reserves toward floral bud differentiation, advancing flowering by 15 to 30 days.
- Alternate bearing management: Solves the chronic on-year/off-year fruiting cycle in commercial mango cultivars like Alphonso, Dashehari, and Banganapalli.
- Canopy management: Restricts internodal elongation, maintaining compact tree canopies suitable for high-density planting.
Soil collar application method and timing
Apply as a targeted soil drench around the tree collar in a shallow 10 to 15 cm deep ring basin dug 0.5 to 1 meter away from the trunk. The optimum application timing is post-monsoon (typically July to September depending on regional rain patterns and cultivar harvesting). Immediately irrigate the ring basin lightly to facilitate active root absorption.
Dosage calculation and environmental precautions
- Dosage is strictly calculated according to canopy spread diameter (typically calculated per meter of canopy spread as per CIBRC approved label recommendations).
- Do not apply to water-stressed, diseased, or young non-bearing orchards under 5 years of age.
- Allow residual breakdown periods between applications to avoid excessive root stunting and compact panicle bunching.
Official source
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Directorate of Plant Protection, Quarantine & Storage (CIBRC) ↗Related on KisanPe
Common questions
What is the primary agricultural use of Paclobutrazol 40% SC?
It is predominantly used in mango orchards to suppress vegetative shoot flushing, stimulate early flowering, and regulate biennial bearing.
How is Paclobutrazol applied to mango trees?
It is applied as a soil drench in a shallow circular ring basin dug around the tree trunk under the drip line, followed by light watering.
Can Paclobutrazol be sprayed as a foliar spray?
No, commercial 40% SC formulations are specifically designed for soil collar drenching where active feeder roots absorb the chemical.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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