There were no accidental or secondary polsonings in any 
of the test areas even though baits were exposed within 100 yards 
of farm dwellings. Dogs were frequently observed in the baited 
areas. Crop damages due to the operation were negligible, and no 
objections from the landowners were registered. 
Tractors used with good results were: Ford, Massey 
Ferguson, John Deere Model 430 and 720 diesel. Under most field 
conditions the Model 430 John Deere, or any other tractor with 
equal power, would be best. 
Possible Applications 
Other possible uses of the "burrow-builder" would be in 
controlling other rodents. Such rodents as kangaroo rats, grass-~ 
hopper mice, ground squirrels, meadow mice, and deer mice have been 
found dead in the artificially constructed burrows; however, the 
machine has not been tested against these animals. 
It is also likely that fresh-cut, root-type baits, such 
as carrots, could be used in the machine. Carrots diced to 3/8 
inch have passed through the feeding mechanism without plugging. 
Work is being done to perfect this procedure. 
