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Open Access Publications from the University of California

Control of ground squirrels in California using anticoagulant treated baits

  • Author(s): Clark, Dell O.
  • et al.

Anticoagulant treated grain baits have been used to control vertebrate pest depredations in California for over 30 years. The use of anticoagulant treated baits has increased 7 times in the past 7 years; the majority for the use of ground squirrel, Spermophilus spp., control. Since 1968-69, an average of 1,747,828 net over 5,700,919 gross acres per year has been treated for ground squirrel control. Current use patterns for ground squirrel control with anticoagulant treated baits include: (1) Repeated spot baitings, and (2) exposure of bait in bait boxes. Experimental work and many years of operational field use have proven that anticoagulant treated baits have a place in effectively suppressing ground squirrel populations in localized areas, with little hazard to non-target animals. However, these baits have not proven to be a practical substitute for current techniques of suppressing ground squirrel populations over large areas, such as in rangeland situations.

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