EPA is revoking certain tolerances for the insecticides acephate and pyrethrins. Also, EPA is modifying certain tolerances for the insecticides acephate and pyrethrins. In addition, EPA is establishing new tolerances for the herbicides MCPA and triallate, and the insecticides fenbutatin-oxide (hexakis) and pyrethrins. The regulatory actions finalized in this document are in follow-up to the Agency's reregistration program under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), and tolerance reassessment program under the Federal Food, Drug, and Cosmetic Act (FFDCA) section 408(q).