40 CFR 180.316 - Pyrazon; tolerances for residues.

Regulations last checked for updates: Oct 02, 2026

Title 40 - Protection of Environment last revised: Sep 29, 2026

View all text of Subpart C [§ 180.101 - § 180.732]

§ 180.316 - Pyrazon; tolerances for residues.

(a) General. Tolerances are established for combined residues of the herbicide pyrazon (5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone) and its metabolites (calculated as pyrazon) in or on the commodities in Table 1 to paragraph (a).

Table 1 to Paragraph (a)

Commodity	Parts per million
Beet, garden, roots ¹	0.9
Beet, garden, tops ¹	7
Beet, sugar, molasses ¹	1.5
Beet, sugar, roots ¹	0.2
Beet, sugar, tops ¹	3
Cattle, fat ¹	0.1
Cattle, liver ¹	0.15
Cattle, meat ¹	0.1
Cattle, meat byproducts, except liver ¹	0.1
Goat, fat ¹	0.1
Goat, liver ¹	0.15
Goat, meat ¹	0.1
Goat, meat byproducts, except liver ¹	0.1
Horse, fat ¹	0.1
Horse, liver ¹	0.15
Horse, meat ¹	0.1
Horse, meat byproducts, except liver ¹	0.1
Milk ¹	0.02
Sheep, fat ¹	0.1
Sheep, liver ¹	0.15
Sheep, meat ¹	0.1
Sheep, meat byproducts, except liver ¹	0.1

¹ There are no U.S. registrations. This tolerance expires on August 26, 2026.

(b)-(c) [Reserved]

(d) Indirect or inadvertent residues. Tolerances are established for combined residues of the herbicide pyrazon, 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone, and its metabolites (calculated as pyrazon), in or on the commodities in Table 2 to paragraph (d).

Table 2 to Paragraph (d)

Commodity	Parts per million
Corn, field, forage ¹	0.5
Corn, field, stover ¹	0.5
Soybean, forage ¹	0.5
Soybean, hay ¹	0.5
Wheat, forage ¹	0.3
Wheat, hay ¹	0.2
Wheat, straw ¹	0.1

¹ There are no U.S. registrations. This tolerance expires on August 26, 2026.

[91 FR 9726, Feb. 27, 2026]

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

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

cite as: 40 CFR 180.316