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Phenology Model Database

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Blackberry Leafhopper

Scientific name: Dikrella californica

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

Williams, D. W. 1984. Ecology of the blackberry-leafhopper-parasite system and its relevance to California grape agroecosystems. Hilgardia 52: 1-32.

Location of study: Northern California (laboratory & field studies)

Developmental thresholds
Lower:46.6°F ( 8.1°C)
Upper:82.4°F (28.0°C)

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

Degree-day accumulations required for each stage of development
Host: BlackberryDD (°F)DD (°C)
Eggs:361.1200.6
Nymphs:454.1252.3
Generation time (egg to adult):815.2452.9
Pre-egglaying adults:254.5141.4
Minimum generation time (egg to egg):1069.7594.3
Average generation time (egg to egg):1935.21075.1

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