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Acrolein (Magnicide ®H) is registered in California as an aquatic herbicide. Studies in Alameda and Modoc Counties were conducted to evaluate the field efficacy of acrolein as a ground squirrel burrow fumigant. Applications of acrolein (92%) at 20 ml and 40 ml per burrow were made from a custom built jet gun connected to a hose which ran to a cylinder mounted on a pickup truck. The burrow openings were covered with soil after application. The application rate of 20 ml of acrolein per burrow provided approximately 90% control of ground squirrels. Acrolein applied at 40 ml did not significantly increase efficacy of the treatment.