Base temperatures used in calculating GDD vary depending on the type of plant or pest that is being monitored. This number represents the temperature at which you will typically begin to see plant or pest growth2. The base temperature most often used in calculations is 50°F (10°C), because it is the temperature when active growth begins for most organisms3. However, some plants or pests can thrive in cooler environments, and in that case, growth should be measured using the base temperature of 32°F (0°C). For more information on which base temperature best suits your turf management plan, please contact your local extension service or Syngenta territory manager.
2United States Golf Association "Getting a Handle on Nature's Clock" 2013.
3United States Golf Association "Getting a Handle on Nature's Clock" 2013.