Placement of leg hold trap. Near the burrow entrance, excavate a small area in a runway just large enough to place the trap. These cardboard cylinders must be ignited and placed in the burrow system. Because of potential fire hazard and gas accumulation in homes, never use a gas cartridge in burrows under homes, tobacco sheds, buildings, dry grass, or near other combustible materials. Other factors determining the success of fumigation include the length and configuration of the burrow system, absorption of gas into soil cracks, and inadequate plugging of all burrow entrances.
Gas cartridges are safe if the user takes a few precautions.
Never use a fumigant in a manner inconsistent with its labeling. Failure to comply with directions may subject you to severe federal or state penalties. Gas cartridges must be ignited by lighting a fuse. They are not bombs and will not explode if properly prepared and used. Always light the end of the fuse, never the cartridge directly.