Phenology models predict timing of events in an organism's development. For many organisms which cannot internally regulate their own temperature, development is dependent on temperatures to which they are exposed in the environment.
Information in this database comes from published articles. It may be used in conjunction with field monitoring and a degree-day calculator.
Note: Before using a model that was not field tested in your location, you should test the model for one or more seasons under your conditions to verify that it will work for you.
Model 1
Obrycki, J. J., and M. J. Tauber. 1981. Phenology of three Coccinellid species: thermal requirements for development. Ann. Entomol. Soc. Amer. 74: 31-36.
- Location of study: Ithaca, New York (laboratory studies)
- Lower developmental threshold: 54.0°F (12.2°C)
- Method of calculation: not specified (UC IPM recommends Single Sine)
Degree-day accumulations required for each stage of development
Host: Pea and green peach aphids
- Eggs: 67.9 (°F) 37.7 (°C)
- Larvae: 225.5 (°F) 125.3 (°C)
- Pupae: 94.3 (°F) 52.4 (°C)
- Generation time (egg to adult): 387.7 (°F) 215.4 (°C)
