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Phenology Model Database

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Northern Corn Rootworm

Scientific name: Diabrotica barberi

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 3

Apple, J. W., E. T. Walgenbach and W. J. Knee. 1971. Thermal requirements for Northern Corn Rootworm egg hatch. J. Econ. Entomol. 64: 853-856.

Location of study: Madison, Wisconsin (laboratory and field studies)

Developmental threshold

Lower: 52.0°F (11.1°C)

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

Degree-day accumulations required for each stage of development

Air temperatures DD (°F) DD (°C)

Median egg hatch: 533.0 296.1

Soil temperatures at 2 inches DD (°F) DD (°C)

First egg hatch: 304.2 169.0

Median egg hatch: 529.9 294.4

Model 2 of 3

Chiang, H. C., and V. Sisson. 1968. Temperature relationships of the development of Northern Corn Rootworm eggs. J. Econ. Entomol. 61: 1406-1410.

Location of study: St. Paul, Minnesota (laboratory and field studies)

Developmental threshold

Lower: 52.0°F (11.1°C)

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

Degree-day accumulations required for each stage of development

Air temperatures DD (°F) DD (°C)

First egg hatch: 500.0 277.8

Soil temperatures at 5-10 cm DD (°F) DD (°C)

First egg hatch: 400.0 222.2

Model 3 of 3

Dominque, C. R. and W. N. Yule. 1983. Threshold temperature and thermal constant for egg development of Northern Corn Rootworm,Diabrotica longicornis (Coleoptera: Chrysomelidae). Can. Ent. 115: 1051-1052.

Location of study: Ste. Anne de Bellevue, Quebec (field studies)

Developmental threshold

Lower: 49.5°F (9.7°C)

Method of calculation: Max-min (UC IPM recommends Single Sine)

Degree-day accumulations required for each stage of development

Start date: April 1

Soil temperatures at 5-10 cm	DD (°F)	DD (°C)
Median egg hatch:	612.0	340.0

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