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How to Manage Pests

Degree-Days: Double Triangulation Method

| Run models | Figures and formulas | About degree-days |

Completely below both thresholds
Degree-days in this case are represented by the area under the temperature curve (straight line between a day?s min and its max) that also lies between the upper and lower thresholds. In this instance the number of degree-days is zero, since both the max and min temperatures are below the lower threshold.

Formula for calculating degree-days (°D) for a 24 hour period. Accumulated degree-days are shaded areas of diagrams.

TU = Upper threshold
TL = Lower threshold
Tmax = Maximum temperature
Tmin = Minimum temperature

Statewide IPM Program, Agriculture and Natural Resources, University of California
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