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How to Manage Pests

Degree-days: Omnivorous Leafroller in Apples

Use this program to run a model of omnivorous leafroller in apples, recommended by UC Cooperative Extension. In calculating degree-days, the program uses temperatures from the UC IPM weather database, a file you supply, or data you enter online.

Omnivorous Leafroller in Apples

  • Lower/upper threshold: 48/87°F
  • Calculation/upper cutoff method: single sine/horizontal
  • Biofix: The biofix is the first date that moths are caught consistently in pheromone traps.
  • Additional information on using this model: Pest Management Guideline

Specify source of temperature data

Select the source of temperatures to be used to calculate degree-days. You may also use your own maximum and minimum temperatures and look up approximate daily degree-day values in a reference degree-day table for omnivorous leafroller, then total them yourself.

Select from stations in which California county?
Include active stations only
Set time period for running model
Biofix (start date):   Biofix (start date): The biofix is the first date that moths are caught consistently in pheromone traps.
End date:
Text file (comma or tab delimited) format

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

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