Research and IPM

Phenology Model Database

Onion Maggot

Scientific name: Delia (Hylemya) antiqua

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 1

Liu, H. J., F. L. McEwen and G. Ritcey. 1982. Forecasting events in the life cycle of the onion maggot, Hylema antiqua (Diptera: Anthomyiidae): Application to control schemes. Environ. Entomol. 11: 751-755.

Location of study: Guelph, Ontario (laboratory and field studies)

Developmental threshold

Lower:

39.9°F

(4.4°C)

Method of calculation: Single Sine

Degree-day accumulations required for each stage of development

Host: Onions	DD (°F)	DD (°C)
Eggs:	90.0	50.0
Larvae:	516.6	287.0
Pupae:	550.8	306.0
Generation time (egg to adult):	1157.4	643.0
Pre-egglaying adults:	185.4	103.0
Generation time (egg to egg):	1342.8	746.0