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
McGiffen, M. E., Jr. and J. B. Masiunas. 1992. Prediction of black and eastern black nightshade (Solanum nigrum and S. ptycanthum) growth using degree-days. Weed Science 40: 86-89.
- Location of study: Illinois (field studies)
- Lower developmental threshold: 42.8°F (6.0°C)
- Method of calculation: Double Sine
Degree-day accumulations required for each stage of development
Biofix: Count degree-days after planting.
Stage
- Flowering: 1080.0 (°F) 600.0 (°C)
- Rapid plant growth: 1620.0 (°F) 900.0 (°C)
- Berry and seed maturity: 1800.0 (°F) 1000.0 (°C)
