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Growing Degree Days. Master Gardener Class 2011 Carol Fryer. How I Did My Research. Google search by topic and specify a university or extension website Search examples: degree days site:edu growing degree days site: vt .edu degree days site: ext.vt .edu. - PowerPoint PPT Presentation
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Master Gardener Class 2011
Carol Fryer
How I Did My ResearchHow I Did My Research
• Google Google search by topic and specify a university or extension website
• Search examples: Search examples: degree days site:edu
growing degree days site:vt.edu degree days site: ext.vt.edu
Results of Google Search
My ChoicesMy Choices
So What are Growing Degree Days?So What are Growing Degree Days?
Growing Degree Days :Growing Degree Days :
• Integrated Pest Management tool
• Tracks and predict stages of insect development based on temperature
• Uses a mathematical calculation system
• Can compare from year to year
• Easy and fun to do!
What does it involve?What does it involve?
* Record daily high and low temperatures and find an average temperature for the day.
Example:Example: 70º Max & 50° Minimum temp/2 = 60° average daily temperature
* Subtract 50º Base Temperature from average temperature: 60 - 50 = 10 Growing Degree Days (GDD)
* Add the GDDs for the Accumulated Growing Degree Days(AGDD) and compare to a chart of insect development by degree days.
Mathematical Equation of GDDMathematical Equation of GDD
Max temperature + Minimum Temp /2 minus Base Temp = Daily GDD
70°(MT) + 50°(min t) /2 = 60°– 50°(BT) = 10 GDD
ChartingCharting
Winfield Solution GDD CalculatorWinfield Solution GDD Calculator
GDD for InsectsGDD for Insects University of NH - Growing Degree Days for Insect Management,
Nancy E. Adams, Extension Educator, Agricultural Resources
Insect GDD - Cornell UniversityInsect GDD - Cornell University
Summary – GDD & Insect Control Summary – GDD & Insect Control
• Record daily high and low temperatures and calculate the average temperature
• Subtract the base temperature from the daily average
• Keep a daily accumulated total of the Growing Degree Days
• Check plants for signs of pests• Use list of insect development to predict
time periods for potentials pests
Don’t Forget the Beneficial Don’t Forget the Beneficial InsectsInsects
ResourcesResources
Websites:www.extension.unh/agric/GDDays/Docs/growch.pdf
www.gardening.cornell.edu
www.virginiafruit.ento.vt.edu/Understanding-Degree-Days.html
www.wfsag.com/UserFiles/File/GDDCalculator.xls
QuestionsQuestions
The END
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