Estimated Degree-Day (DD) Accumulations 
for June 18 and Predicted Peak Activity 
Dates for Sugarbeet Root Maggot Flies 
in Red River Valley
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             Air DD   Expected Date of 
Site         (sine)    Peak Activity*
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Cavalier       422         June 28
Fargo          602         June 18
Grand Forks    520         June 22
Hillsboro      520         June 20
St. Thomas     463       June 25-26
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* Peak fly activity in current-year beets 
  is most likely on the first calm or 
  light-wind day to reach 80% F after the 
  required 600 air DD are accumulated.