The biochemical sodium p-nitrophenolate is exempted from the requirement of a tolerance when used as a plant growth regulator in end-use product at a concentration of 0.3% by weight and applied at an application rate of 20 g of a.i. per acre or less per application, in or on all food commodities. [65 FR 66181, Nov. 3, 2000] Sec. 180.1142 1,4-Dimethylnaphthalene; exemption from the requirementof a tolerance.
An exemption from the requirement of a tolerance is established for the residues of the plant growth regulator, 1,4-dimethylnaphthalene (1,4-DMN), when applied postharvest to all sprouting root, tuber, and bulb crops in accordance with good agricultural practices. [77 FR 68697, Nov. 16, 2012]