CFR › Title 40 › Part 180 › §180.122040 CFR §180.1220Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkAn exemption from the requirement of a tolerance is established for residues of the 1-Methylcyclopropene in or on fruits and vegetables when:(a)Used as a post harvest plant growth regulator, i.e., for the purpose of inhibiting the effects of ethylene.(b)Applied or used outdoors for pre-harvest treatments.