. Control of injurious rodents in California. Rodents; Mammals; Zoology, Economic. 24 California Agricultural Extension Service [Cm. 79 then, 1)efore the young- are ])orn, means from 4 to 12 fewer gophers for the next season. The methods in use against pocket gophers are: (1) trapping; (2) poisoning; (3) gassing; (4) flooding; (5) fencing; (6) encouragement of natural enemies; (7) miscellaneous. Each has its particular advan- tages, and best results follow use of two or more methods. 1. Trapping: Many special kinds of traps have been designed to cap- ture pocket gophers (fig. 4). The usual sna
. Control of injurious rodents in California. Rodents; Mammals; Zoology, Economic. 24 California Agricultural Extension Service [Cm. 79 then, 1)efore the young- are ])orn, means from 4 to 12 fewer gophers for the next season. The methods in use against pocket gophers are: (1) trapping; (2) poisoning; (3) gassing; (4) flooding; (5) fencing; (6) encouragement of natural enemies; (7) miscellaneous. Each has its particular advan- tages, and best results follow use of two or more methods. 1. Trapping: Many special kinds of traps have been designed to cap- ture pocket gophers (fig. 4). The usual snap and steel traps used against. Fig. 4.—Different kinds of traps for pocket gophers; all are shown as set, ready for use. rats and mice and for carnivorous mammals are ineffective against go- phers, which must be trapped in their burrows where space for operation of a trap is limited. The special traps fall into two classes: those de- signed to spring when a gopher pushes a load of earth against the flat trigger pan of the trap, and those operated by a bait trigger, moved when the gopher seizes the special bait. Trapping is especially adapted to gardens, orchards, small fields, and banks of irrigating canals. In California, more gopher control is prob- ably accomplished by traps than by any other single method. Traps are useful in following up and capturing individual gophers. The special gopher traps are safe to handle and require only a limited amount of skill and a little digging to place them. On one ranch near Davis a work- man handled about 75 traps, set usually in pairs. These required about 5 hours of time to examine and reset as needed daily, and on 3 successive days took 38, 40, and 37 gophers, respectively. The most successful and most commonly used trap in California is the Macabee (fig. 5a), constructed entirely of wire except for the trigger. The next most popular is the box type with a choker effect (fig. 4, upper left). Numerous other types have been designed
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