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
Eckenrode, C. J., and R. K. Chapman. 1972. Seasonal adult cabbage maggot populations in the field in relation to thermal-unit accumulations. Ann. Entomol. Soc. Amer. 65: 151-156.
- Location of study: Arlington & Kenosha, Wisconsin (field studies)
- Lower developmental threshold: 43.0°F (6.1°C) (based on air temperatures)
- Method of calculation: Modified Max-min (UC IPM recommends Single Sine)
Degree-day accumulations required for each stage of development
Host: Cabbage
- First adult spring emergence: 300.0 (°F) 166.7 (°C)
- Generation time (adult to adult): 1176.0 (°F) 653.3 (°C)
Model 2
Eckenrode, C. J., and R. K. Chapman. 1971. Effect of various temperatures upon rate of development of the cabbage maggot under artificial conditions. Ann. Entomol. Soc. Amer. 64: 1079-1083.
- Location of study: Madison, Wisconsin (laboratory studies) These values were validated in field in Wisconsin.
- Lower developmental threshold: 43.0°F (6.1°C) (based on soil temperatures)
- Method of calculation: Modified Max-min (UC IPM recommends Single Sine)
Degree-day accumulations required for each stage of development
Host: Turnip
- First adult spring emergence: 243.0 (°F) 135.0 (°C)
- Generation time (adult to adult): 1112.0 (°F) 617.8 (°C)
Model 3
Vincent, C., and R. K. Stewart 1981. Evaluation de deux types de pieges pour le depistage des adultes de la mouche de chou, Hylemya (Delia) brassicae (Wiedemann) (Diptera: Anthomyiidae). Ann. Soc. Ent. Quebec. 26: 41-50.
- Location of study: Ste. Anne de Bellevue, Quebec (field studies)
- Lower developmental threshold: 42.8°F (6.0°C)
- Method of calculation: Max-min (UC IPM recommends Single Sine)
Degree-day accumulations required for each stage of development
Adult Development
- First adult spring emergence: 345.6 (°F) 192.0 (°C)
- 1st adult peak: 565-716 (°F) 314-398 (°C)
- 2nd adult peak: 470-1728 (°F) 847-960 (°C)
- 3rd adult peak: 2602-2887 (°F) 1446-1604 (°C)
