Research and IPM

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.

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:	342.0	190.0
Generation time (adult to adult):	891.9	495.5
Soil temperatures at 5.7 cm.	DD (°F)	DD (°C)
50% spring emergence:	370.8	206.0
Generation time (adult to adult):	1044.0	580.0

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:	54.0	30.0
Larvae:	367.2	204.0
Pupae:	255.6	142.0
Generation time (egg to adult):	676.8	376.0