CIB&RC · Plant growth regulators
PGRs look like plant nutrition products but are regulated as insecticides. Positioning a product on the wrong side of that line is an expensive mistake.
How are plant growth regulators registered in India?
Plant growth regulators are registered with CIB&RC under the Insecticides Act, 1968, in the same way as pesticides, through Form I under Section 9. They are not biostimulants: the FCO definition of a biostimulant introduced by S.O. 882(E) of 2021 excludes pesticides and plant growth regulators regulated under the Insecticides Act.
The boundary that decides everything
| Plant growth regulator | Biostimulant | |
|---|---|---|
| How it acts | Hormonal or hormone-like regulation of plant growth and development | Stimulates physiological processes — nutrient uptake, use efficiency, stress tolerance, quality |
| Regulated under | Insecticides Act, 1968 | Fertiliser (Control) Order, 1985 |
| Authority | CIB&RC | Controller of Fertilisers and States |
| Approval | Registration under Section 9 | Inclusion in Schedule VI |
The FCO biostimulant definition expressly excludes pesticides and plant growth regulators regulated under the Insecticides Act. So a product whose effect comes from growth-regulating activity cannot be registered as a biostimulant simply because its marketing emphasises yield or quality. The mode of action and the claim decide the regime.
This matters commercially because biostimulant and PGR data packages differ substantially. Generating a Schedule VI dossier for what is in fact a PGR, or the reverse, means starting again under the correct regime.
Common PGR uses
- Fruit set, fruit size and fruit thinning
- Flowering induction and regulation
- Growth retardation and lodging control
- Ripening and degreening
- Rooting
- Breaking dormancy
What the registration requires
PGRs follow the same routes as other insecticides — Section 9(4) where the same active and formulation is already registered, Section 9(3) where it is not. The data package covers chemistry, specification and analytical methods, stability and shelf life, toxicology as applicable, residue data supporting the waiting period, and bio-efficacy supporting the growth-regulating claim on each crop.
Bio-efficacy for PGRs is different
For a pesticide, efficacy means control of a pest. For a PGR, it means a measurable effect on the plant — fruit set, size, timing of flowering, degree of growth retardation — at a defined dose and timing. PGR effects are often highly sensitive to application timing, crop stage, variety and dose, and can turn from beneficial to harmful across a narrow range. Phytotoxicity evaluation therefore carries particular weight, and trials must establish the safe window as well as the effective one.
Residue matters for fruit crops
Many PGRs are used on fruit and horticultural crops close to harvest, and many of those crops are exported. Residue data and the resulting waiting period have direct commercial consequences, and destination-market residue limits may be tighter than Indian ones.
Where PGR registrations go wrong
- Filed under the wrong regime — positioned as a biostimulant to avoid the Insecticides Act, then challenged on mode of action
- Claims broader than the crop-by-crop data — PGR effects do not transfer reliably between crops
- No safe window established — trials showing benefit at one dose without showing where phytotoxicity begins
- Timing omitted from the label — a PGR label without precise growth-stage guidance invites misuse
Frequently Asked Questions
Are plant growth regulators registered under FCO or CIBRC?
Under CIB&RC and the Insecticides Act, 1968. The FCO biostimulant definition introduced by S.O. 882(E) of 2021 expressly excludes pesticides and plant growth regulators regulated under the Insecticides Act.
Can I register my PGR as a biostimulant instead?
Not if its effect comes from growth-regulating activity. The mode of action and the claim decide the regime, and positioning a PGR as a biostimulant risks the product being challenged and the data package being generated under the wrong regime.
What bio-efficacy data does a PGR need?
Data demonstrating the measurable effect on the plant — fruit set, size, flowering, growth retardation — at defined doses and timings on each claimed crop, together with phytotoxicity data establishing the safe window.
Can a PGR claim be extended to more crops later?
Yes, with supporting bio-efficacy and residue data for each additional crop. PGR effects are crop-specific and do not reliably transfer, so each extension needs its own evidence.
Do PGRs used on export fruit need special residue attention?
Yes. Destination markets set their own residue limits, often lower than Indian ones, so the waiting period and residue data should be designed with export limits in view.
Reviewed: 22 September 2026 · Reflects the Insecticides Act, 1968 and Insecticides Rules, 1971 as amended, including the Insecticides Third (Amendment) Rules, 2026 (G.S.R. 597(E) dated 8 July 2026). General guidance only — confirm current requirements before acting.
PGR or biostimulant — not sure which?
Send us the composition, mode of action and intended claim. We will confirm the regime before you generate any data.
Talk to Our Regulatory Team