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Phenology Model Database

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Carrot Weevil

Scientific name: Listronotus oregonensis

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 2

Simonet, D. E., and B. L. Davenport. 1981. Temperature requirements for development and oviposition of the carrot weevil. Ann. Entomol. Soc. Amer. 74: 312-315.

Location of study: Wooster, Ohio (laboratory and field studies) Field data validated degree-day intervals predicted by lab data.

Developmental threshold

Lower: 44.6°F (7.0°C)

Method of calculation: Single Sine

Degree-day accumulations required for each stage of development

Host: Carrot DD (°F) DD (°C)

Eggs: 234.0 130.0

Larvae: 460.8 256.0

Prepupae: 205.2 114.0

Pupae: 234.0 130.0

Generation time (egg to adult): 1134.0 630.0

Model 2 of 2

Boivin, G. 1988. Effects of carrot developmental stages on feeding and oviposition of carrot weevil, Listronotus oregonensis (Le Conte) (Coleoptera: Curculionidae). Environ. Entomol. 17: 330-336.

Location of study: Southwestern Quebec, Canada (field studies)

Developmental threshold

Lower: 44.6°F (7.0°C)

Method of calculation: Single Sine

Degree-day accumulations required for each stage of development

Start date: January 1

Host: Carrot	DD (°F)	DD (°C)
Air temperatures were used in degree-day calculations
Preoviposition	264.6	147.0
90% oviposition	820.8	456.0
Sow carrots after 770°F (400°C) degree-days to avoid carrot weevil damage.

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