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Phenology Model Database

Seedcorn Maggot

Scientific name: Delia (Hylemya) platura

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 2

Funderburk, J. E., L. G. Higley and L. P. Pedigo. 1984. Seedcorn maggot (Diptera: Anthomyiidae) phenology in central Iowa and examination of a thermal-unit system to predict development under field conditions. Environ. Entomol. 13: 105-109.

Location of study: Ames, Iowa (field studies)

Developmental threshold
Lower:39.0°F( 3.9°C)
Upper:84.2°F(29.0°C)

Method of calculation:Max-min (UC IPM recommends Single Sine)
Cutoff method:Horizontal

Degree-day accumulations required for each stage of development
Air temperatures:DD (°F)DD (°C)
50% spring emergence:342.0190.0
Generation time (adult to adult):891.9495.5
Soil temperatures at 5.7 cm.DD (°F)DD (°C)
50% spring emergence:370.8206.0
Generation time (adult to adult):1044.0580.0


Model 2 of 2

Sanborn, S. M., J. A. Wyman, and R. K. Chapman. 1982. Threshold temperature and heat unit summations for seedcorn maggot development under controlled conditions. Ann. Ent. Soc. Amer. 75: 103-106.

Location of study: Madison, Wisconsin (laboratory studies)

Developmental threshold
Lower:39.0°F(3.9°C)

Method of calculation: not specified (UC IPM recommends Single Sine)

Degree-day accumulations required for each stage of development
 DD (°F)DD (°C)
Eggs:54.030.0
Larvae:367.2204.0
Pupae:255.6142.0
Generation time (egg to adult):676.8376.0


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