Section 180.226 - Diquat; tolerances for residues(a)General.(1) Tolerances are established for the residues of the herbicide diquat, including its metabolites and degradates, in or on the commodities in Table 1 to this paragraph (a)(1) resulting from the application of the dibromide salt of diquat. Compliance with the tolerance levels specified in Table 1 to this paragraph (a)(1) is to be determined by measuring only diquat (6,7-dihydrodipyrido[1,2-a:2',1'-c]pyrazinediium): | Commodity | Parts per million |
| Alfalfa, seed | 3.0 |
| Cattle, fat | 0.05 |
| Cattle, meat | 0.05 |
| Cattle, meat byproducts | 0.05 |
| Canola, meal | 6.0 |
| Canola, seed | 2.0 |
| Egg | 0.05 |
| Goat, fat | 0.05 |
| Goat, meat | 0.05 |
| Goat, meat byproducts | 0.05 |
| Hog, fat | 0.05 |
| Hog, meat | 0.05 |
| Hog, meat byproducts | 0.05 |
| Horse, fat | 0.05 |
| Horse, meat | 0.05 |
| Horse, meat byproducts | 0.05 |
| Milk | 0.02 |
| Pea and bean, dry and shelled, except soybean, subgroup 6C1 | 0.9 |
| Potato | 0.1 |
| Poultry, fat | 0.05 |
| Poultry, meat | 0.05 |
| Poultry, meat byproducts | 0.05 |
| Sheep, fat | 0.05 |
| Sheep, meat | 0.05 |
| Sheep, meat byproducts | 0.05 |
1 There are no U.S. registrations for these commodities as of October 22, 2020.
(2)(i) Tolerances are established for residues of the herbicide diquat (6,7 dihydrodipyrido(1,2-a:2'1'-c)pyrazinediium) (calculated as the cation) derived from the application of the dibromide salt to ponds, lakes, reservoirs, marshes, drainage ditches, canals, streams, and rivers which are slow-moving or quiescent in programs of the Corp of Engineers or other Federal or State public agencies and to ponds, lakes and drainage ditches only where there is little or no outflow of water and which are totally under the control of the user, in or on the following food commodities: | Commodity | Parts per million |
| Avocado | 0.2 |
| Berry group 13 | 0.05 |
| Cotton, undelinted seed | 0.2 |
| Cranberry | 0.05 |
| Fish | 2.0 |
| Fruit, citrus, group 10 | 0.05 |
| Fruit, pome, group 11 | 0.02 |
| Fruit, stone, group 12 | 0.02 |
| Grain, cereal, forage, fodder and straw, group 16 | 0.02 |
| Grain, cereal, group 15 | 0.02 |
| Grape | 0.05 |
| Grass, forage, fodder and hay, group 17 | 0.2 |
| Hop, dried cones | 0.2 |
| Nut, tree, group 14 | 0.02 |
| Shellfish | 20.0 |
| Strawberry | 0.05 |
| Sugarcane, cane | 0.2 |
| Vegetable, brassica, leafy, group 5 | 0.05 |
| Vegetable, cucurbit, group 9 | 0.02 |
| Vegetable, foliage of legume, group 7 | 0.2 |
| Vegetable, fruiting, group 8 | 0.05 |
| Vegetable, leafy, except brassica, group 4 | 0.05 |
| Vegetable, root and tuber, group 1 | 0.02 |
| Vegetable, seed and pod | 0.05 |
(ii) Where tolerances are established at higher levels from other uses of diquat on the subject crops, the higher tolerances applies also to residues of the aquatic uses cited in this paragraph.(3) Tolerances are established for the plant growth regulator diquat (6,7 dihydrodipyrido(1,2-a:2'1'-c)pyrazinediium) derived from application of the dibromide salt and calculated as the cation in or on the following food commodites: | Commodity | Parts per million |
| Banana1 | 0.05 |
| Coffee, bean, green1 | 0.05 |
| Soybean, hulls | 0.6 |
1There are no U.S. registrations as of May 26, 2010.
(4) A tolerance of 0.5 part per million is established for residues of diquat in potato, granules/flakes and potato, chips.(b)Section 18 emergency exemptions. [Reserved](c)Tolerances with regional registrations. [Reserved](d)Indirect or inadvertent residues. [Reserved]65 FR 33709, May 24, 2000, as amended at 72 FR 41929, Aug. 1, 2007; 75 FR 29441, May 26, 2010; 75 FR 60241, Sept. 29, 2010; 85 FR 67290, Oct. 22, 2020