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Phenology Model Database

Pistachio - Shell Hardening

Scientific name: Pistacia vera

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

Purcell, M., and S. C. Welter. 1991. Effect of Calocoris norvegicus (Hemiptera: Miridae) on pistachio yields. J. Econ. Entomol. 84: 114-119.

Location of study: California (field studies)

Developmental threshold
Lower:50F(10°C)

Method of calculation: Single Sine

Degree-day accumulations required for each stage of development

Biofix: 75% bloom of pistachios

 DD (°F)DD (°C)
Pistachio shell hardening:1197665


Statewide IPM Program, Agriculture and Natural Resources, University of California
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Accessibility   /PHENOLOGY/mp-pistachio_shell.html revised: December 17, 2003. Contact webmaster.