Degree Days Help Predict Crop and Insect Growth
Ellen Phillips, Extension Educator – Crop Systems,
Countryside Extension Center, 708-352-0109, firstname.lastname@example.org
Development of agricultural pests and crop growth can be tracked
and projected by maintaining an account of the "heat"
accumulated during each day in the growing season. This process
involves a comparison of daily maximum and minimum temperatures
to a base temperature, specific for a particular pest or crop,
above which development will occur. New websites assist growers
in quickly calculating this data.
Pest Degree Days: http://www.sws.uiuc.edu/warm/pestdata
Crop Degree Days: http://ipm.uiuc.edu/degreedays/index.html
To use the calculators, begin by selecting the closest of 19
weather stations to your location. Then chose the crop or pest
of interest. Degree-day accumulations for some pests have a specific
calendar day when accumulations begin, such as January 1 each
year. Crop calculations begin later in the year. Accumulations
for other pests are tied to specific events; such as pheromone
trap catch or finding eggs. Maps of degree-day totals and projections
for the entire state are then produced and may be used to assist
your scouting efforts.
This webpage is a collaboration combining daily weather data
collected by the Illinois State Water Survey and pest information
furnished by the Department of Crop Sciences to provide daily,
up-to-date information about pest development in Illinois.