---
kind: "section"
citation: "40 C.F.R. § 180.547"
title: "40"
number: "180.547"
heading: "Prohexadione calcium; tolerances for residues."
url: "https://uscodex.org/cfr/40/180.547"
---

# §180.547. Prohexadione calcium; tolerances for residues.

- (a) **General.** Tolerances are established for residues of the growth regulator, prohexadione calcium, including its metabolites and degradates, in or on the commodities in the table below. Compliance with the tolerance levels specified below is to be determined by measuring only prohexadione calcium (calcium 3-oxido-5-oxo-4-propionylcyclohex-3-enecarboxylate)” in or on the following commodities.
- (b) **Section 18 emergency exemptions.** [Reserved]
- (c) **Tolerances with regional registrations.** Tolerances with regional registration are established for residues of the plant growth regulator, prohexadione calcium, including its metabolites and degradates, in or on the commodities in table 2 in this [paragraph (c)](#c). Compliance with the tolerance levels specified in table 2 in this [paragraph (c)](#c) is to be determined by measuring only prohexadione calcium (calcium 3-oxido-5-oxo-4-propionylcyclohex-3-enecarboxylate) in or on the following commodities.
- (d) **Indirect or inadvertent residues.** [Reserved]

## Notes

### Amendments

[65 FR 25660, May 3, 2000, as amended at 66 FR 29712, June 1, 2001; 76 FR 71464, Nov. 18, 2011; 80 FR 38980, July 8, 2015; 85 FR 8461, Feb. 14, 2020]

### Authority

Authority: 21 U.S.C. 321(q), 346a and 371.

### Source

Source: 36 FR 22540, Nov. 25, 1971, unless otherwise noted.

### Amendments

[65 FR 25660, May 3, 2000, as amended at 66 FR 29712, June 1, 2001; 76 FR 71464, Nov. 18, 2011; 80 FR 38980, July 8, 2015; 85 FR 8461, Feb. 14, 2020]