Section 180.659 - Pyroxasulfone; tolerances for residues(a)General.(1) Tolerances are established for residues of the herbicide pyroxasulfone, including its metabolites and degradates, in or on the commodities in the table below. Compliance with the tolerance levels specified below is to be determined by measuring only the sum of pyroxasulfone, 3-[[[5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl]methyl]sulfonyl]-4,5-dihydro-5,5-dimethylisoxazole, and its metabolite, 5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-carboxylic acid (M-3), calculated as the stoichiometric equivalent of pyroxasulfone, in or on the commodity. | Commodity | Parts per million |
| Corn, field, grain | 0.02 |
| Corn, pop, grain | 0.015 |
| Corn, sweet, kernel plus cob with husks removed | 0.015 |
| Cottonseed, subgroup 20C | 0.04 |
| Wheat, grain | 0.03 |
(2) Tolerances are established for residues of the herbicide pyroxasulfone, including its metabolites and degradates, in or on the commodities in the table below. Compliance with the tolerance levels specified below is to be determined by measuring only the sum of pyroxasulfone, 3-[[[5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl]methyl]sulfonyl]-4,5-dihydro-5,5-dimethylisoxazole, and its metabolites, 5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl]methanesulfonic acid (M-1); 5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-carboxylic acid (M-3); and [5-(difluoromethoxy)-3-(trifluoromethyl)-1H-pyrazol-4-yl]methanesulfonic acid (M-25), calculated as the stoichiometric equivalent of pyroxasulfone, in or on the commodity. | Commodity | Parts per million |
| Corn, field, forage | 0.09 |
| Corn, field, stover | 0.15 |
| Corn, pop, stover | 0.15 |
| Corn, sweet, forage | 0.10 |
| Corn, sweet, stover | 0.15 |
| Cotton, gin byproducts | 0.20 |
| Soybean, forage | 1.0 |
| Soybean, hay | 2.0 |
| Wheat, forage | 6.0 |
| Wheat, hay | 1.0 |
| Wheat, straw | 0.60 |
(3) Tolerances are established for residues of the herbicide pyroxasulfone, including its metabolites and degradates, in or on the commodities in the table below. Compliance with the tolerance levels specified below is to be determined by measuring only the sum of pyroxasulfone, 3-[[[5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl]methyl]sulfonyl]-4,5-dihydro-5,5-dimethylisoxazole, and its metabolites, 5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-carboxylic acid (M-3); [5-(difluoromethoxy)-3-(trifluoromethyl)-1H-pyrazol-4-yl]methanesulfonic acid (M-25); and 3-[1-carboxy-2-(5,5-dimethyl-4,5-dihydroisoxazol-3-ylthio)ethylamino]-3-oxopropanoic acid (M-28), calculated as the stoichiometric equivalent of pyroxasulfone, in or on the commodity. | Commodity | Parts per million |
| Soybean, seed | 0.06 |
(4) Tolerances are established for residues of the herbicide pyroxasulfone, including its metabolites and degradates, in or on the commodities in the following table. Compliance with the tolerance levels specified in the following table is to be determined by measuring only the sum of pyroxasulfone [3-[[[5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl]methyl]sulfonyl]-4,5-dihydro-5,5-dimethylisoxazole] and its metabolites [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl]methanesulfonic acid (M-1) and 5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-carboxylic acid (M-3), calculated as the stoichiometric equivalent of pyroxasulfone, in or on the commodity. | Commodity | Parts per million |
| Milk | 0.003 |
(5) Tolerances are established for residues of the herbicide pyroxasulfone, including its metabolites and degradates, in or on the commodities in the table below. Compliance with the tolerance levels specified below is to be determined by measuring only the sum of pyroxasulfone (3-[(5-difluoromethoxy-1-methyl-3-(trifluoromethyl)pyrazol-4-ylmethylsulfonyl]-4,5-dihydro-5,5-dimethyl-1,2-oxazole), and its metabolites, M-1 (5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazol-4-yl) methanesulfonic acid), M-3 (5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazol-4-carboxylic acid), M-25 (5-difluoromethoxy-3-trifluoromethyl-1H-pyrazol-4-yl)methanesulfonic acid) and M-28 (3-[1-carboxy-2-(5,5-dimethyl-4,5-dihydroisoxazol-3-ylthio)ethylamino]-3-oxopropanoic acid) calculated as the stoichiometric equivalent of pyroxasulfone, in or on the following commodities: | Commodity | Parts per
million |
| Flax, seed | 0.07 |
| Leaf petiole vegetable subgroup 22B | 0.80 |
| Pea and bean, dried shelled, except soybean, subgroup 6C | 0.15 |
| Peanut | 0.30 |
| Peanut, hay | 4.0 |
| Peanut, meal | 0.40 |
| Potato, granules/flakes | 0.20 |
| Peppermint, fresh leaves | 0.20 |
| Peppermint, oil | 0.70 |
| Soybean, vegetable, succulent shelled | 0.40 |
| Spearmint, fresh leaves | 0.20 |
| Spearmint, oil | 0.70 |
| Sunflower subgroup 20B | 0.30 |
| Vegetable, bulb, group 3-07 | 0.15 |
| Vegetable, foliage of legume, except soybean, subgroup 7A | 3.0 |
| Vegetable, soybean, edible podded | 0.40 |
| Vegetable, tuberous and corm, subgroup 1C | 0.08 |
(b)Section 18 emergency exemptions. [Reserved](c)Tolerance with regional registrations. Tolerances are established for residues of the herbicide pyroxasulfone, including its metabolites and degradates, in or on the commodities in the table below. Compliance with the tolerance levels specified below is to be determined by measuring only the sum of pyroxasulfone (3-[(5-difluoromethoxy-1-methyl-3-(trifluoromethyl)pyrazol-4-ylmethylsulfonyl]-4,5-dihydro-5,5-dimethyl-1,2-oxazole), and its metabolites, M-1 (5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazol-4-yl)methanesulfonic acid), M-3 (5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazol-4-carboxylic acid), M-25 (5-difluoromethoxy-3-trifluoromethyl-1H-pyrazol-4-yl)methanesulfonic acid) and M-28 (3-[1-carboxy-2-(5,5-dimethyl-4,5-dihydroisoxazol-3-ylthio)ethylamino]-3-oxopropanoic acid) calculated as the stoichiometric equivalent of pyroxasulfone, in or on the commodity. | Commodity | Parts per
million |
| Grass, forage | 0.50 |
| Grass, hay | 1.0 |
(d)Indirect or inadvertent residues. [Reserved] 77 FR 12213 , Feb. 29, 2012, as amended at 78 FR 13257 , Feb. 27, 2013; 78 FR 46279 , July 31, 2013; 79 FR 34633 , June 18, 2014; 82 FR 18235 , Apr. 18, 2017; 83 FR 22859 , May 17, 2018; 83 FR 54264 , Oct. 29, 2018 82 FR 18235, 4/18/2017; 83 FR 22859, 5/17/2018; 83 FR 54264, 10/29/2018