Biochemical mode of action in fruit crops
Paclobutrazol acts as a gibberellin biosynthesis inhibitor by blocking the oxidation of ent-kaurene to ent-kaurenoic acid. By suppressing vegetative shoot extension, it redirects plant photosynthates toward flower bud differentiation, encouraging uniform panicle emergence and fruit set.
- Active ingredient: Paclobutrazol 23% SC (suspension concentrate)
- Chemical class: Triazole growth retardant (anti-gibberellin)
- Primary benefits: Regularizes alternate bearing, reduces tree canopy height, and promotes early synchronized flowering
Application method in mango orchards
Paclobutrazol is applied as a soil drench around the collar zone of mango trees 60 to 90 days before the expected flowering flush (typically July to September depending on variety and agro-climatic zone). The dose is calculated strictly based on tree canopy diameter and age as per university package of practices.
Precautions and soil health considerations
Because paclobutrazol has high soil persistence, avoid indiscriminate yearly application, which can cause excessive tree stunting and panicle compaction. Never apply to unhealthy, drought-stressed, or young non-bearing trees, and maintain adequate soil moisture and organic manure.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the primary purpose of Paclobutrazol in mango farming?
It inhibits vegetative flushes and promotes consistent, early flowering to overcome alternate bearing in commercial mango cultivars.
How is Paclobutrazol applied to trees?
It is applied as a soil drench within a circular trench under the tree canopy drip line 2 to 3 months prior to expected flowering.
Can Paclobutrazol be sprayed as a foliar spray on mango?
No, it is formulated specifically for root uptake through soil drenching, as foliar absorption in mature mango leaves is poor.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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