Research and IPM

Phenology Model Database

Cabbage Maggot

Scientific name: Delia (Hylemya) radicum

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 3

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)

Developmental threshold

Lower:	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	DD (°F)	DD (°C)
First adult spring emergence:	300.0	166.7
Generation time (adult to adult):	1176.0	653.3

Model 2 of 3

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.

Developmental threshold

Lower:	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	DD (°F)	DD (°C)
First adult spring emergence:	243.0	135.0
Generation time (adult to adult):	1112.0	617.8

Model 3 of 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)

Developmental threshold

Lower:	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

	DD (°F)	DD (°C)
First adult spring emergence:	345.6	192.0
1st adult peak	565-716	314-398
2nd adult peak	470-1728	847-960
3rd adult peak	2602-2887	1446-1604