University of California

Degree-days: An aid in crop and pest management


Lloyd T. Wilson
William W. Barnett

Authors Affiliations

Lloyd T. Wilson is Assistant Professor, Department of Entomology, University California, Davis; William W. Barnett is Area Specialist, University of California, Fresno County.

Publication Information

Hilgardia 37(1):4-7. DOI:10.3733/ca.v037n01p4. January 1983.

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Questions such as when to plant, whether the crop is developing on time, and when to initiate pest control actions are particularly difficult to answer, because the timing is not always the same each year. Growth and development of insects and plants can vary as much as two to three weeks from the “normal” time, depending on whether temperatures are above or below the average. In this article we compare different techniques for predicting temperature-related insect population and crop development.

Wilson L, Barnett W. 1983. Degree-days: An aid in crop and pest management. Hilgardia 37(1):4-7. DOI:10.3733/ca.v037n01p4
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