WISCONSIN INSECT SURVEY RESULTS 2017 AND OUTLOOK FOR 2018

2018

  • Krista Hamilton
  • Wisconsin Department of Agriculture Trade and Consumer Protection
Project Media

The fall European corn borer population declined to 0.03 larva per plant, tying 2012 and
2014 as the second lowest state average in the survey’s 76-year history. The lowest average
of 0.02 larva per plant was recorded in 2015. Minor population reductions from 2016 were
found in six of the state’s nine agricultural districts, while an insignificant increase was
noted in the east-central area. The northeast and southeast district averages remained
unchanged at 0.0 and 0.04 larva per plant, respectively. One hundred and ninety-six of the
229 (86%) fields examined showed no evidence of corn borer infestation. Results of the
2017 survey suggest that Wisconsin corn producers are maintaining a high Bt use rate which
continues to provide overall effective suppression of the European corn borer.
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