40 CFR § 180.316 - Pyrazon; tolerances for residues.

---
identifier: "/us/cfr/t40/s180.316"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 180.316 - Pyrazon; tolerances for residues."
title_number: 40
title_name: "Protection of Environment"
section_number: "180.316"
section_name: "Pyrazon; tolerances for residues."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "E"
subchapter_name: "PESTICIDE PROGRAMS"
part_number: "180"
part_name: "TOLERANCES AND EXEMPTIONS FOR PESTICIDE CHEMICAL RESIDUES IN FOOD"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 321(q), 346a and 371."
regulatory_source: "36 FR 22540, Nov. 25, 1971, unless otherwise noted."
cfr_part: "180"
---


# 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(2*H*)-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 | 0.9 |
| Beet, garden, tops | 7 |
| Beet, sugar, molasses | 1.5 |
| Beet, sugar, roots | 0.2 |
| Beet, sugar, tops | 3 |
| Cattle, fat | 0.1 |
| Cattle, liver | 0.15 |
| Cattle, meat | 0.1 |
| Cattle, meat byproducts, except liver | 0.1 |
| Goat, fat | 0.1 |
| Goat, liver | 0.15 |
| Goat, meat | 0.1 |
| Goat, meat byproducts, except liver | 0.1 |
| Horse, fat | 0.1 |
| Horse, liver | 0.15 |
| Horse, meat | 0.1 |
| Horse, meat byproducts, except liver | 0.1 |
| Milk | 0.02 |
| Sheep, fat | 0.1 |
| Sheep, liver | 0.15 |
| Sheep, meat | 0.1 |
| Sheep, meat byproducts, except liver | 0.1 |
| 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(2*H*)-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 | 0.5 |
| Corn, field, stover | 0.5 |
| Soybean, forage | 0.5 |
| Soybean, hay | 0.5 |
| Wheat, forage | 0.3 |
| Wheat, hay | 0.2 |
| Wheat, straw | 0.1 |
| There are no U.S. registrations. This tolerance expires on August 26, 2026. |  |

[91 FR 9726, Feb. 27, 2026]