Sugar Beet Maggot

The concept of Growing Degree Days is a measure of the amount of heat that is accumulated based on the average temperature over a given period of time. For instance, most corn varieties require approximately 2000 growing degree days to mature given a base temperature of 50 degrees. Not only can you estimate the phenology stage of a plant based on growing degree days, but you can also estimate insect emergence or life cycle phase based on degree days as well. For instance, considering the projected temperatures for the first 10 days of June, peak fly activity of sugar beet maggot will likely be commencing in the next couple of weeks based on degree day accumulation since April 1.