Active Ingredient and Physiological Mode of Action
ProGibb Easy is formulated with Gibberellic Acid GA3 at a high concentration of 40 percent in water-soluble granule form. GA3 is a naturally occurring plant hormone that plays a central role in regulating developmental processes such as stem elongation, seed germination, dormancy breaking, and fruit enlargement.
Upon application, GA3 stimulates both cell division and longitudinal cell elongation by increasing the plasticity of plant cell walls. In table grape production, this mode of action is crucial for elongating berry pedicels, thinning compact flower clusters, and driving uniform fruit growth.
- Active Hormone: Gibberellic Acid (GA3) 40% WSG (Water-Soluble Granule).
- Cell Elongation: Stimulates rapid elongation of cells in developing fruit and vegetative tissues.
- Cluster Loosening: Lengthens cluster rachis and flower pedicels, preventing bunch overcrowding.
- WSG Formulation: Dissolves rapidly and completely in water without leaving gritty residue in spray nozzles.
Key Horticultural Applications and Timing
In viticulture, ProGibb Easy is applied in carefully timed sequential stages: early flower elongation, bloom thinning (to reduce berry set in tight clusters), and post-bloom berry sizing passes. Loosening the cluster structure allows better air circulation, drastically lowering downy mildew and botrytis bunch rot infection risks.
Beyond table grapes, gibberellic acid formulations are utilized in citrus to retard rind senescence and extend harvest timing, in cherries to increase fruit firmness and size, and in sugarcane to stimulate internode elongation for enhanced cane biomass.
- Grape Rachis Elongation: Sprayed at early bud burst to extend cluster framework before bloom.
- Berry Sizing Dip/Spray: Applied during 3 to 6 mm berry stages to accelerate pulp cell expansion.
- Rot Reduction: Improved cluster aeration prevents fungal bunch rots and berry splitting.
- Citrus Application: Enhances peel integrity and reduces post-harvest rind breakdown.
Application Guidelines and Safety Precautions
Because plant growth regulators are biologically active at extremely low concentrations, precision dosing is imperative. Over-application can induce undesirable vegetative shoot elongation, flower bud drop, or abnormal fruit shapes.
Ensure spray water pH is slightly acidic to neutral (pH 5.5 to 6.5), as alkaline water rapidly hydrolyzes gibberellins. Apply during calm, humid morning or evening hours to extend droplet drying time and maximize hormone uptake through leaf and berry cuticles.
- Water Quality: Use clean, neutral-to-acidic water; avoid hard, alkaline spray mixtures.
- Precision Measuring: Accurately weigh granules with fine digital scales strictly according to CIBRC label directions.
- Uniform Wetting: Use calibrated mist sprayers or bunch dipping cups for thorough, direct fruit coverage.
- Protective Measures: Wear protective gloves, goggles, and face masks during chemical handling.
Official source
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Central Insecticides Board and Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the primary active ingredient in ProGibb Easy?
ProGibb Easy contains Gibberellic Acid (GA3) 40% WSG (water-soluble granules), a potent plant growth regulator that stimulates cell elongation and division.
Why is ProGibb Easy widely used in commercial grape vineyards?
Grape growers use ProGibb Easy to elongate bunch clusters, thin excess flowers, increase individual berry diameter, and improve air circulation to prevent bunch rot.
What happens if a farmer overdoses Gibberellic Acid on crops?
Overdosing GA3 can cause excessive vegetative shoot growth, weakened stems, flower abortion, poor color development, and reduced return bloom in the following season.
Where can growers find certified crop-specific dosage rates for ProGibb Easy?
Certified dosage rates, timing stages, and crop approvals are detailed on the product container label and verified on the official CIBRC portal.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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