Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
§ 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.

Commodity Parts per
million
Cattle, kidney0.10
Cattle, meat byproducts, except kidney0.05
Cherry, sweet0.40
Fruit, pome, group 113.0
Goat, kidney0.10
Goat, meat byproducts, except kidney0.05
Grass, forage 10.10
Grass, hay 10.10
Grass, seed screenings 13.5
Grass, straw 11.2
Hog, kidney0.10
Hog, meat byproducts, except kidney0.05
Horse, kidney0.10
Horse, meat byproducts, except kidney0.05
Peanut1.0
Peanut, hay0.60
Sheep, kidney0.10
Sheep, meat byproducts, except kidney0.05
Strawberry0.30
Watercress4.0

1Registration is limited to grass grown for seed.

(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). Compliance with the tolerance levels specified in table 2 in this paragraph (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.

Table 2 to Paragraph (c)

Commodity Parts per
million
Alfalfa, forage0.1
Alfalfa, hay0.1
Corn, field, forage0.1
Corn, field, grain0.1
Corn, field, stover0.1

(d) Indirect or inadvertent residues. [Reserved]

[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: 21 U.S.C. 321(q), 346a and 371
source: 36 FR 22540, Nov. 25, 1971, unless otherwise noted.
cite as: 40 CFR 180.547