Repellency of chemically-tested ovitraps to ovipositing Aedes triseriatus was tested using abate (temephos) 5G, Dursban (chlorpyrifos) 1G, and Dursban 2E. Using ovitrap grids in three Southwestern Wisconsin woodlots, it was found that ovitraps treated with Abate 5G and Dursban 1G at rate of 1125 ppm did not appear to repel ovipositing mosquitoes. Ovitraps treated with Dursban 2E were repellent to ovipositing Ae. triseriatus throughout a 5 week test. Although quantitative data were not obtained in the field tests, a substantial number of female mosquitoes were killed, presumably by toxic residue, in the Dursban 1G-treated ovitraps, with fewer being killed in the Abate 5G and Dursban 2E-treated traps. Exposure of caged mosquitoes in the laboratory to Abate 5G or Dursban 1G ovitraps resulted in an average adult mortality of 30.5 and 71%, respectively. Larvicidal activity in all treated ovitraps persisted through the 5 weeks of testing; when tested using mosquito larvae bioassay, 100% mortality was recorded in all treated water samples. Larvicidal activity of the three insecticides in oak tree holes still persisted at the conclusion of the experiment 11 months after application. Potential population reductions of Ae. triseriatus obtainable by larvicides as compared to the use of "filler" materials in tree holes are discussed.