Chlorpyrifos, bendiocarb, trichlorfon, and isofenphos were applied as surface sprays to Kentucky bluegrass turf, and effects on nontarget arthropods were measured. The most abundant families of predaceous Insecta, Araneida, and Acari were Staphylinidae, Erigonidae, Parasitidae, and Eupodidae. Chlorpyrifos and isofenphos had the greatest impact on predaceous arthropods, with some taxa significantly reduced for at least 6 weeks. Effects of bendiocarb and trichlorfon were generally less severe and more temporary. Oribatid mite populations were apparently unaffected by the insecticides. Bendiocarb increased trap catches of ants for up to 2 weeks after application.