Vectobac and Bactimos corn cob granules were evaluated for control of Aedes species mosquito larvae in woodland pools. No significant differences were seen between the 2 formulations. Both provided greater than 90% control at application rates as low as 100 mg/m2 (0.89 lb/acre) and greater than 98% control at label-specified field application rates (2.5 or 5 lb/acre).