40 CFR § 180.721 - Isoprothiolane; tolerances for residues.

---
identifier: "/us/cfr/t40/s180.721"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 180.721 - Isoprothiolane; tolerances for residues."
title_number: 40
title_name: "Protection of Environment"
section_number: "180.721"
section_name: "Isoprothiolane; 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"
---


# 180.721 Isoprothiolane; tolerances for residues.

(a) *General.* Tolerances are established for residues of the fungicide isoprothiolane, 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 residues of isoprothiolane (bis(1-methylethyl) 2-(1,3-dithiolan-2-ylidene)propanedioate) in or on the commodities:

Table 1 to Paragraph (**a**)

| Commodity | Parts per million |
| --- | --- |
| Banana | 0.9 |
| Rice, bran | 15 |
| Rice, husked | 6 |
| Rice, polished rice | 1.5 |
| There are no U.S. registrations as of December 6, 2021. |  |

(b)-(d) [Reserved]

[86 FR 68925, Dec. 6, 2021]