§ 180.659 - Pyroxasulfone; tolerances for residues.  


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  • § 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, grain0.02
    Corn, pop, grain0.015
    Corn, sweet, kernel plus cob with husks removed0.015
    Cottonseed, subgroup 20C0.04
    Wheat, grain0.03

    (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, forage0.09
    Corn, field, stover0.15
    Corn, pop, stover0.15
    Corn, sweet, forage0.10
    Corn, sweet, stover0.15
    Cotton, gin byproducts0.20
    Soybean, forage1.0
    Soybean, hay2.0
    Wheat, forage6.0
    Wheat, hay1.0
    Wheat, straw0.60

    (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, seed0.06

    (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
    Milk0.003

    (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, seed0.07
    Leaf petiole vegetable subgroup 22B0.80
    Pea and bean, dried shelled, except soybean, subgroup 6C0.15
    Peanut0.30
    Peanut, hay4.0
    Peanut, meal0.40
    Potato, granules/flakes0.20
    Peppermint, fresh leaves0.20
    Peppermint, oil0.70
    Soybean, vegetable, succulent shelled0.40
    Spearmint, fresh leaves0.20
    Spearmint, oil0.70
    Sunflower subgroup 20B0.30
    Vegetable, bulb, group 3-070.15
    Vegetable, foliage of legume, except soybean, subgroup 7A3.0
    Vegetable, soybean, edible podded0.40
    Vegetable, tuberous and corm, subgroup 1C0.08

    (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, forage0.50
    Grass, hay1.0

    (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]