Section 180.905 - Pesticide chemicals; exemptions from the requirement of a tolerance(a) When applied to growing crops, in accordance with good agricultural practice, the following pesticide chemicals are exempt from the requirement of a tolerance: (b) When applied to growing crops, in accordance with good agricultural practice, the pesticides rotenone or derris or cube roots are exempt from the requirement of a tolerance. There are no U.S. registrations for use of rotenone, derris, or cube roots on food commodities as of March 23, 2011.(c) These pesticides are not exempted from the requirement of a tolerance when applied to a crop at the time of or after harvest. 77 FR 59128 , Sept. 26, 2012