Three concentrations (0.1%, 0.2%, and 0.3% active ingredient) of strychnine-treated chopped cabbage bait were effective in reducing Richardson ground squirrel (spermophilus richardsonii nevadensis) populations. Strychnine concentrations in the bait showed a significant (P<0.05) negative effect on the number of live ground squirrels observed aboveground after bait was applied. Adjusted percent reduction in aboveground ground squirrel counts were: 71%, 71%, and 88% respectively for the 0.1%, 0.2%, and 0.3% strychnine baits.
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