An innovative approach to pocket gopher fumigation

Trials have been done in which pocket gopher (Thomomys bottae) burrows were treated using a U.S. Fish & Wildlife Service gas cartridge followed by fumigation using gasoline engine exhaust fumes from a rototiller with a converted exhaust system fitted with a hose. The exhaust replaced the good air in the burrow system with the lethal carbon monoxide and the smoke fumes from the gas cartridge. The gases are rapidly forced into the far extremities of the runways, as can be detected by slight smoke seepage. The motor is left running for several minutes. The rodents rarely have time to plug their burrows or escape to the surface. We obtained a high degree of control. This method is also effective on ground squirrels in open areas where the soil is relatively moist