Research and IPM
Phenology Model Database
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 of 1
Pasian, C.C., and J.H. Lieth. 1994. Prediction of flowering rose shoot development based on air temperature and thermal units. Scientia Horticulturae 59:131-145.Pasian, C.C., and J.H. Lieth. 1996. Prediction of rose shoot development: model validation for the cultivar 'Cara Mia' and extension to the cultivars 'Royalty' and 'Sonia'. Scientia Horticulturae 66:117-124.
Location of study: Davis, California (greenhouse studies)
Method of calculation: Max-Min Method: Degree-days = [(Tmax - Tmin)/2] - To, where Tmax is the daily max temperature, Tmin is the daily min temperature, To is the lower threshold. Set Degree-days to 0 when To > (Tmax - Tmin)/2.
Degree-day accumulations required for each stage of development