CONTROL OF GROUND SQUIRRELS. 



H. J. QUAYLE. 



There an- two methods of destroying ground squirrels: first, by means 

 of poisoned grain, and, second, by the liberation of carbon bisulfid 

 in their burrow.s. Which of the methods to be followed will depend 

 upon tin- season, th<- poison .irrain im-tlmd brinr more effective during 

 the dry season, while the carbon bisulfid treatment will be more effective 

 during the rainy season when there is sufficient soil moisture to prevent 

 the ircnenil diffusion of tin- iras In-yond the open burrows. 



FIG. 2. Arranged from left to right are the ground squirrels of less economic 

 importance in California, the Oregon ground squirrel (Citellus oregonus), golden- 

 mantled ground squirrel (Callosppriiiovhiius chr ysodeirus ) , Antelope ground squirrel 

 (AmmoBpermophiliu Irucurus), and the desert, or round-tailed ground squirrel 

 (Citellus tereticaudus) . 



Where ground squirrels are abundant over considerable areas, the 

 simplest, most effective and least expensive way to destroy them is by 

 the use of poisoned orrain.^ Barley is the grain to be preferred, since it 

 is more attractive v tae squirrels and less likely to be eaten by birds. 



The formula and method of preparation are as follows : 



< 'l-'jiti barley 20 quarts. 



Strychnia sulphate ( ground or powdered I 1 ounce. 



Saccharine 1 teaspoonful. 



Gloss starch (or'dinary laundry starch) \ teacupful. 



W;r 1* pints. 



