40 CFR § 180.570 - Isoxadifen-ethyl; tolerances for residues.

---
identifier: "/us/cfr/t40/s180.570"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 180.570 - Isoxadifen-ethyl; tolerances for residues."
title_number: 40
title_name: "Protection of Environment"
section_number: "180.570"
section_name: "Isoxadifen-ethyl; 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"
---


# 180.570 Isoxadifen-ethyl; tolerances for residues.

(a) *General.* (1) Tolerances are established for residues of isoxadifen-ethyl (ethyl 5,5-diphenyl-2-isoxazoline-3-carboxylate, (CAS No. 163520-33-0), and its metabolite: 4,5-dihydro-5,5-diphenyl-3-isoxazolecarboxylic acid, when used as an inert ingredient (safener) in or on the following raw agricultural commodities:

| Commodity | Parts per million |
| --- | --- |
| Corn, field, forage | 0.20 |
| Corn, field, grain | 0.08 |
| Corn, field, stover | 0.40 |
| Corn, oil | 0.50 |
| Corn, pop, grain | 0.04 |
| Corn, pop, stover | 0.25 |
| Corn, sweet, forage | 0.30 |
| Corn, sweet, kernel plus cob with husk removed | 0.04 |
| Corn, sweet, stover | 0.45 |

(2) Tolerances are established for the residues of isoxadifen-ethyl (3-isoxazolecarboxylic acid, 4,5-dihydro-5,5-diphenyl-, ethyl ester (CAS No. 164520-33-0)), and its metabolites 4,5-dihydro-5,5-diphenyl-3-isoxazolecarboxylic acid and β-hydroxy-β-benzenepropanenitrile when used as an inert ingredient (safener) in or on the following raw agricultural commodities:

| Commodity | Parts per million |
| --- | --- |
| Rice, grain | 0.10 |
| Rice, hulls | 0.50 |

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

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

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

[66 FR 33187, June 21, 2001, as amended at 66 FR 40141, Aug. 2, 2001; 67 FR 12878, Mar. 20, 2002; 69 FR 29890, May 26, 2004; 72 FR 63997, Nov. 14, 2007; 80 FR 72599, Nov. 20, 2016]