EPA is revoking certain tolerances for the fungicides dicloran and thiophanate-methyl; the herbicides EPTC, hexazinone, picloram, and propazine; the defoliant and herbicide cacodylic acid; the plant growth regulator and herbicide diquat, the insecticides disulfoton, methamidophos, methomyl, phosmet, piperonyl butoxide, pyrethrins, and thiodicarb; the fumigant antimicrobial and insecticide methyl bromide, and the nematicides/insecticides ethoprop and fenamiphos, and the tolerance exemptions for the insecticide/miticide pyrethrum and insecticide synergist N-octyl bicycloheptene dicarboximide. However, EPA will not revoke specific malathion tolerances at this time. In addition, EPA is removing certain expired tolerances for disulfoton, fenamiphos, and thiophanate-methyl. Also, EPA is modifying certain tolerances for the fungicide thiophanate-methyl, herbicides dicamba, EPTC, hexazinone and picloram, and insecticide synergist N-octyl bicycloheptene dicarboximide. In addition, EPA is establishing new tolerances for the fungicide thiophanate-methyl and the herbicides EPTC, hexazinone, and picloram. Also, EPA is reinstating specific tolerances for methamidophos residues as a result of the application of the insecticide acephate. 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).