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Research and IPM

Phenology Model Database

Voria ruralis

Scientific name: Voria ruralis (a larval parasite of cabbage looper)

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 1

Jackson, C. G., G. D. Butler, Jr., and D. E. Bryan. 1969. Time required for development of Voria ruralis and its host, the cabbage looper, at different temperatures. J. Econ. Entomol. 62: 69-70.

Location of study: Tucson, Arizona (laboratory studies)

Developmental thresholds
Lower:45.5°F(7.5°C)

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

Degree-day accumulations required for each stage of development
Host: Cabbage looperDD (°F)DD (°C)
Eggs+larvae 227.5126.4
Pupae:196.7109.3
Generation time (egg to adult):424.3235.7


Statewide IPM Program, Agriculture and Natural Resources, University of California
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