Termiticide concentrations (ppm) in aggregate fill were determined by measuring active ingredient (a.i.) residues of two pyrethroid termiticides, Up-Cyde Pro® 2EC-cypermethrin, and BaseLine® EC-bifenthrin, at 24.0 hours, and then at 6.0- and 12.0-months after ‘horizontal’ surface applications, perimeter ‘trenching and rodding’ applications, or ‘rodding only’ trench applications at lowest label rates to two common building construction aggregate foundation fills often used in the state of Oklahoma, USA. Residues were determined within 5.1-cm-deep multiple-core composite aggregate fill samples extracted after surface applications, and 15.2-cm-deep multiple-core composite samples extracted from interior foundation perimeter trenches. Before termiticide applications were conducted, all test plots were raked to a level surface, then half the test plots were compacted and half remained not compacted. Residue concentrations were significantly influenced by aggregate fill type, regardless ofwhether compacted or not compacted.

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