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Research and IPM

Phenology Model Database

| More models | Calculate degree-days |
="Egyptian

Egyptian Alfalfa Weevil

Scientific name: Hypera brunnipennis

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

Integrated Pest Management for Alfalfa Hay. University of California Statewide IPM Project. Div. Agr. Sci. Publ. #4104. pp. 47-50.

Location of study: California

Developmental threshold
Lower:45.0°F (7.2°C)

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

Degree-day accumulations required for each stage of development
Host: Alfalfa HayDD (°F)DD (°C)
Eggs:211.0117.2
Larvae:372.6207.0
Pupae:284.2157.9
Generation time (egg to adult):867.8482.1
Pre-egglaying adults (after aestivation): 279.0155.0

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