Soil drenches with insecticides have been used as a component of Tephritid fruit fly eradication in the United States and in California in particular. Diazinon, the insecticide of choice as a soil drench has been banned in the United States. We evaluated Platinum, Force, Admire, Regent, and Warrior as controls of the Mediterranean Fruit Fly, Ceratitis capitata (Wiedemann), melon fly, Bactrocera cucurbitae (Coquillett), and oriental fruit fly, Bactrocera dorsalis (Hendel) in Hawaii. Some insecticides were effective against one or two of the fruit fly species, but only Warrior and Force approached the effectiveness of diazinon against all three species. The order of toxicity for C. capitata from most toxic to least toxic was: diazinon>Force=Warrior>Admire=Platinum>Regent. The order of toxicity for B. dorsalis was: diazinon>Platinum=Warrior=Force>Regent=Admire. The order of toxicity for B. cucurbitae was: Warrior=diazinon>Force=Regent=Platinum=Admire. Studies in sand were followed by an evaluation of specific concentrations of Warrior and Force in soil collected from two sites on the island of Kauai. The performance of both products was lower in soil compared to sand. Minimum concentrations that caused 95% mortality in two soils collected on Kauai were also determined in the laboratory for Warrior and Force and compared to diazinon. Average concentrations that caused at least 95% mortality in all three fruit species were 121 g ai/ha for Force and 363 g ai/ha for Warrior compared to 182 g ai/ha for diazinon.