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Degree days are units of measurement reflecting just how hot or cold the weather has been. This is useful because insect, disease and weed pests develop more rapidly when temperatures are warmer. Growing Degree Days are those days necessary for these organisms to complete their growth and development.
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1. Why measure Growing Degree Days?
2. How do you calculate Growing Degree Days?
3. When do you start?
4. What tools do you need for gathering temperature data?
5. Do's and Don'ts of Using Degree Days
(Lesser of Max. Temperature or Max. Threshold + Greater of Min. Temperature or Base Temperature)
– Base Temperature
= Growing Degree Days
Calculate Growing Degree Days to monitor pest emergence.
Rely on calendar dates for pest emergence.
Record the daily high and low temperatures.
Spray on schedules and disregard emergence data.
Know the thresholds for the pests you wish to monitor.
Think that degree day calculations are too complicated to do.
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