How to Manage Pests

Degree-days: San Jose Scale in Pears

Use this program to run a model of san jose scale in pears, 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.

San Jose Scale in Pears

Lower/upper threshold: 51/90°F
Calculation/upper cutoff method: single sine/horizontal
Biofix: The biofix is the first date that male scales are consistently caught, or when first crawlers are caught.
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 san jose scale, 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 male scales are consistently caught, or when first crawlers are caught.
End date:

Text file (comma or tab delimited) format

Top of page

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. web template revised: May 17, 2013 Contact webmaster.