European Corn Borer

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