40 CFR § 180.209 - Terbacil; tolerances for residues.

---
identifier: "/us/cfr/t40/s180.209"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 180.209 - Terbacil; tolerances for residues."
title_number: 40
title_name: "Protection of Environment"
section_number: "180.209"
section_name: "Terbacil; 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"
---


# 180.209 Terbacil; tolerances for residues.

(a) *General.* Tolerances are established for residues of the herbicide terbacil, including its metabolites and degradates, in or on the commodities in table 1 to this paragraph (a). Compliance with the tolerance levels specified in table 1 to this paragraph (a) is to be determined by measuring only the sum of terbacil (5-chloro-3-(1,1-dimethylethyl)-6-methyl-2,4(1*H,*3*H*)-pyrimidinedione) and its metabolites 3-*tert*-butyl-5-chloro-6-hydroxymethyluracil, 6-chloro-2,3-dihydro-7-hydroxymethyl 3,3-dimethyl-5*H*-oxazolo(3,2-a) pyrimidin-5-one, and 6-chloro-2,3-dihydro-3,3,7-trimethyl-5*H*-oxazolo(3,2-a) pyrimidin-5-one, calculated as the stoichiometric equivalent of terbacil, in or on the commodity.

Table 1 to Paragraph (**a**)

| Commodity | Parts per million |
| --- | --- |
| Alfalfa, forage | 1 |
| Alfalfa, hay | 2 |
| Apple | 0.3 |
| Asparagus | 0.4 |
| Blueberry | 0.2 |
| Caneberry subgroup 13A | 0.2 |
| Peach | 0.2 |
| Peppermint, fresh leaves | 2 |
| Spearmint, fresh leaves | 2 |
| Strawberry | 0.1 |
| Sugarcane, cane | 0.4 |
| Watermelon | 1 |

(b) *Section 18 emergency exemptions.* [Reserved]

(c) *Tolerances with regional registrations.* [Reserved]

(d) *Indirect or inadvertent residues.* [Reserved]

[71 FR 30818, May 31, 2006, as amended at 91 FR 8104, Feb. 20, 2026]