Ground Squirrel BMPs
  • Biology
    • Range and Habitat
    • Behavior and Diet
    • Seasonal Activity
    • Disease
  • Identification
    • Signs and Characteristics
    • Damage
    • Look-Alike Pests and Damage
    • Burrowing Non-Target Wildlife
    • Squirrel Species of Lesser Concern
  • Management
    • California ground squirrel
    • Belding's ground squirrel
  • Regulations
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Spreader Calibration


​When broadcasting bait for California ground squirrel management, aim to distribute approximately 4 kernels per square foot. A calibrated spreader is essential to successful broadcast baiting.
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How to Calibrate a Bait Spreader

1.     Designate a test area that is at least 25 feet long and 4 feet wide (find a clean, flat area or lay out a tarp).​
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2.     Fill the hopper of the spreader with clean oats and walk through the center of     the test area (starting at a short side) while turning the crank at a fixed rate per step (start turning the crank before you reach the test area and continue until you have cleared the test area). 
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3.     Count the number of oats in random 1-square foot sections along the entire length of the 25-foot test area. Record the number of oats counted in each square. Count 20 random squares from one end to the other (it is important to count random squares and not just the areas where the most oat kernels lie).
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4.     Calculate the average number of oats per square foot for this trial run.​
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5.     Repeat steps 2-4 at least four more times.
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6.     Calculate the average number of oats per square foot for all five trials. Compare this average to your goal of 4.13 oats per square foot. Adjust the spreader accordingly until your average and your goal are similar.​
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Download this guide to spreader calibration as a PDF
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​© 2017 Regents of the University of California  |  Division of Agriculture and Natural Resources  |  UC Cooperative Extension, Orange County
www.groundsquirrelbmp.com is a UC peer-reviewed publication made possible by support from the Vertebrate Pest Control Research Advisory Committee
Updated Feb. 3, 2017
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  • Biology
    • Range and Habitat
    • Behavior and Diet
    • Seasonal Activity
    • Disease
  • Identification
    • Signs and Characteristics
    • Damage
    • Look-Alike Pests and Damage
    • Burrowing Non-Target Wildlife
    • Squirrel Species of Lesser Concern
  • Management
    • California ground squirrel
    • Belding's ground squirrel
  • Regulations
    • California Codes
    • Professional Licenses
    • Fumigation Plans and Posting
    • Wildlife and Endangered Species
  • Resources
  • FAQs