CONTROL METHODS
| CONTROL METHOD | TIME OF YEAR | EFFICACY | COST OF MATERIALS | LABOR | RESTRICTIONS |
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| NA | NA | NA | NA | NA | |
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| NA | NA | NA | NA | NA |
X=low XX=medium XXX=high
The graphs below are the product of a computer simulation program that estimates what a squirrel population would look like over time depending on various control methods. These graphs will give you a rough estimate of the results you can expect from a well-executed control program.
Population left untreated.
Total population of ground squirrels for years 1-3. These years illustrate the stability of the population.
Anticoagulant treated population graph.
Total population of ground suirrels for years 1-3. The solid blue line (------) represents an uncontrolled, stable population. The dashed red line ( - - - - - ) represents a population treated with anticoagulants in the fall. The dark dots (...........) represent a population treated in the summer and the fall with anticoagulants.
Fumigation treated population graph.
Total population of ground squirrels for years 1-3. The solid blue line (------) represents an uncontrolled, stable population. The dashed red line ( - - - - - ) represents a population exposed only once to fumigation in the spring. The dark dots (.........) represent a population exposed for 2 springs to fumigation.
Multi-control population graph.
Total population of ground squirrels for years 1-3. The solid line (------) represents an uncontrolled, stable population. The dashed red line ( - - - - - ) represents a population exposed fumigation in the spring in May. The orange dots (.........) represent a population treated with anticoagulants in July. The dashed green line ( - - - - ) represents a population treated with fumigation in the spring followed by anticoagulants in the summer. Mortality was calculated as 90% for both control techniques.
Stroud, Dennis C., 1983. Seasonal Activity Demography Dispersal and A Population Simulation Model of the California Ground Squirrel, Spermophilus beecheyi. PhD. Thesis, University of California, Davis. 149 pages.