PERC Rodent Controller

Live in colonies with several ground squirrels per burrow system.
Holes are kept open.
Ground squirrels hibernate in the winter with males surfacing a couple weeks earlier than the females, usually in February.
Ground squirrel season extends from February till the food supply is exhausted, usually into August or September.
They will usually have one litter a year numbering from 4 to 10.
They eat green surface foliage and will denude the immediate area around their burrow openings.
They will forage up to 100' from their burrow opening.
The Belding ground squirrel can multiply at a very rapid rate and can exceed 100 rodents per acre.
Holes can be part of a huge mound or partially hidden with no mound.
Mounds can be several feet in diameter, over 12" high and packed very hard with squirrel traffic.
Main holes can be 12" in diameter at the opening and burrows several feet deep.
Different holes and burrows within a colony may or may not be connected.

UC Davis: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7438.html
California Ground Squirrel Info: http://www.etc-etc.com/sqrlinfo.htm
Colorado State University: http://www.ext.colostate.edu/pubs/natres/06505.html
Animal Diversity Web: http://animaldiversity.ummz.umich.edu/site/accounts/information/Spermophilus_tridecemlineatus.html

Old mounds should be harrowed or otherwise reduced prior to treatment.
Populations can be reduced by 70 percent or more from first treatment.
Two or three subsequent treatments can reduce populations by 95 percent.
All active live holes must be treated and sealed with dirt.
Only fresh active open holes need be treated a second and third time.
Treating ground squirrels in hibernation is not successful.
Old infestations are difficult to treat due to the huge burrow complexes.
Economic viability of treatment has to be determined by the farmer/rancher.
New infestations can be totally eliminated with PERC treatments.

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Ground Squirrels