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Research and IPMPhenology Model Database
Alfalfa WeevilScientific name: Hypera postica 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 2Guppy, J. C., and M. K. Mukerji. 1974. Effects of temperature on developmental rate of the immature stages of the alfalfa weevil, Hypera postica (Coleoptera: Curculionidae). Can. Ent. 106: 93-100. Location of study: Ottawa, Ontario (laboratory & field studies) Developmental thresholds
Degree-day accumulations required for each stage of development Biofix: First occurrence or peak of an earlier stage.
Model 2 of 2Whiteford, F., and S. S. Quisenberry. 1990. Population dynamics and seasonal biology of the alfalfa weevil (Coleoptera: Curculionidae) on alfalfa in Louisiana. Environ. Entomol. 19: 1443-1451. Location of study: Baton Rouge, Louisiana (field studies) Developmental threshold
Method of calculation: Max-min (UC IPM recommends Single Sine) Degree-day accumulations required for each stage of development Start date: December 1
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