Research and IPM

Phenology Model Database

Pear Psylla

Scientific name: Cacopsylla pyricola

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

Horton, D. R., B. S. Higbee, T. R. Unruh, and P. H. Westigard. 1992. Spatial characteristics and effects of fall density and weather on overwintering loss of pear psylla (Homoptera: Psyllidae). Environ. Entomol. 21: 1319-1332.

Location of study: Yakima, WA and Medford, OR (field studies)

Developmental thresholds

Lower:

41F

(5°C)

Method of calculation: Double Sine

Degree-day accumulations required for each stage of development

Start date: January 1