Information on degree days for tree pest management has been compiled based on a pest of interest. For more information, follow the link to the article below.

Read about using growing degree days.
Forecast important life stages of specific landscape insect pests with typical degree day accumulations in your area.
List of the growing degree day maps in numerical order.
Michigan map with county borders for reference in locating your farm on the degree day maps.

Note: The maps use Adobe pdf reader. A free version is available at:
http://www.adobe.com/products/acrobat/readstep2.html

If you would like to save a copy of the degree day maps to your computer for easier viewing, please follow the steps below.

1. Open the document in your browser.
2. Go to File, Save As, choose where to save the document on your computer, and hit "Save."

The file is then available to view while you are not connected to the Internet.

Example of a map showing the accumulation of 1100 degree days (base 50°F) by location in Michigan and surrounding states.