The efficacy and persistence of spinosad, a commercial bacterial insecticide, against stored-grain insects on whole grains has been documented through laboratory and field trials. The effectiveness of spinosad on extruded products on stored-grain insects is unknown. In laboratory tests, sawtoothed grain beetle, red flour beetle, and warehouse beetle were exposed to untreated chicken feed pellets and dry commercial dog food and pellets and dog food that had been treated with 1, 3, 5, and 10 mg (AI)/kg of dry formulation (0.05% AI) spinosad. Adults (25) were added to untreated or spinosad-treated chicken feed or dog food and examined after 7 and 14 days to determine mortality and after 49 days to determine adult progeny production and damage. Spinosad was effective in killing all three species at different rates.