European Corn Borer

WI-MN Cooperative Extension Agricultural Weather Page

Introduction

Development of European corn borer can be estimated using a Modified base 50 F degree-day calculation. For this pest the degree-day summation is started well before the growing season. Critical values for European corn borers are listed in the table below (data from J.W. Apple, Department of Entomology, University of Wisconsin-Madison).

Development Stage	Accumulated Degree Days
First Generation
First spring moth	374
First eggs	450
Peak spring moths	631
First generation treatment period	800-1000
Second Generation
First summer moths	1400
First eggs	1450
First egg hatch	1550
Peak summer moths	1733
Second generation treatment period	1550-2100

Schedule

Map is updated daily at about 11:30 am, from mid-April through July, depending slightly on the season.

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For further information alfalfa weevile in Wisconsin,
contact Bryan Jensen of the IPM Program, Univ. of Wisconsin-Madison
Bryan Jensen, bjensen@calshp.cals.wisc.edu

For further information on this page,
contact Bill Bland at the Dept. of Soil Science, Univ. of Wisconsin-Madison
Bill Bland, wlbland@facstaff.wisc.edu