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UNIVERSITY OP CALIFOENIA — EXPERIMENT STATION 



3. FLOODING 



As has been pointed out above, flooding of fields is often an essential 

 part of agriculture in irrigated sections. The main point, then, is to 

 see to it that the gophers which are flooded out and seek the higher 

 borders are promptly dispatched. A good dog will do this effectively 

 until he gets tired, and then the farmer must be ready to give the 

 gophers proper attention with the back of a shovel. 



Fig. 3. — a. Eegiilar Macabee gopher trap. h. Reconstructed Macabee trap 

 used to catch "wise" gophers, and moles. 



4. CARBON BISULPHIDE; GASOLINE 

 Carbon bisulphide is volatile as well as inflammable and the gas 

 from it is explosive, so that caution should attend its use. Its use is ad- 

 visable only when the ground is damp or full of water, as the cracks 

 in dry ground let the gas escape. It does not seem to be so effective 

 on gophers as on ground squirrels, for the gopher burrows are much 

 more extensive and the gopher is therefore harder to reach. It is more 

 valuable as a "follow up" method than for general application. 



There are two methods of applying carbon bisulphide. The first is 

 to pour about a tablespoonful on cotton waste, corncobs or other 

 absorbent material, which is then quickly pushed down the hole and 

 the opening promptly and tightly closed. The better way is by use of 



