Living plants and plant pests develop according to degree days. A calendar does not provide an accurate forecast for scouting for various pests. University of Illinois has developed a degree day calculator to help farmers determine when to look for various insects and diseases. It is kind of late for this year, but the calculator might be a good tool for next year. Keep in mind that degree days will vary field to field, so it is best to have temperature readings close by.
Degree Day Calculator
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