EPA is revoking certain tolerances for the insecticides/ nematicides aldicarb, ethoprop, and oxamyl; the insecticides disulfoton, malathion, and methyl parathion; the miticide/acaricide propargite; the fungicides o-phenylphenol and its sodium salt, triadimefon, triadimenol, and ziram; the herbicides ametryn, dicamba, diuron, oxyfluorfen, and paraquat; the growth regulator/herbicide dimethipin; and the antimicrobial/insecticidal fumigant propylene oxide. Also, EPA is modifying certain tolerances for the insecticide/ nematicide oxamyl; the insecticide fenitrothion; the miticide/acaricide propargite; the molluscicide metaldehyde; the fungicides triadimefon and tridemorph; the herbicides ametryn, 2,4-DB, dicamba, and diuron; and the antimicrobial/insecticidal fumigant propylene oxide. In addition, EPA is establishing tolerances for the insecticide/nematicide oxamyl; the molluscicide metaldehyde; the fungicides etridiazole and streptomycin; the herbicides 2,4-DB, dicamba, and diuron; and the antimicrobial/insecticidal fumigant propylene oxide and propylene chlorohydrin (a reaction product formed during the propylene oxide sterilization process). Finally, because tolerances expired in 2005, EPA is removing 40 CFR 180.167 for nicotine-containing compounds. 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).