UC IPM Online UC ANR home page UC IPM home page


SKIP navigation


Research and IPM

Interactive Tools and Models: Citrus Thrips Scarring Prediction Model—Testing Phase*
San Joaquin Valley, California

This model, validated so far only in Tulare County, California, is a first step in developing a reliable prediction of citrus thrips damage with advance warning. It estimates the degree of first scarring of Navel oranges by citrus thrips, Scirtothrips citri, from weather data that accumulates prior to petal fall.

*Validation of this model has been limited, and you are encouraged to test the model to see if it is helpful to you under your field conditions. You can also help us to test and improve the model. Disclaimer: The University of California and the authors of this model do not assume any responsibility and cannot be held liable for any loss that may result from using predictions from this model.

Estimates for active stations in counties:
| Fresno | Kern |  Madera | Tulare |
Choose year
Or use your own weather data  

Predictions are based on actual weather data. When a prediction is available for a station (usually between March 17 and the end of April), it is posted here.

County Active Weather Stations 2019
Estimated damage
Days with estimated temperatures
Fresno CARUTHERS-01.P, CAR 29.9% 3 of 89 days
Coalinga, CIMIS #205 33.9% 4 of 89 days
Del_Rey/Fowler-01.P, DELF 42.7% 18 of 90 days
EASTON-01.P, EAS 28.5% 4 of 89 days
Firebaugh/Telles, CIMIS #7 36.7% 1 of 91 days
Five Points/WSFS USDA, CIMIS #2 22.5% 4 of 88 days
Fresno State, CIMIS #80 33.7% 0 of 90 days
Five Points South West, CIMIS #190 39.5% 6 of 87 days
KINGSBURG-01.P, KNG 38.4% 6 of 89 days
Kearney_Ag_Ctr-01.P, KAC 23.8% 0 of 89 days
Orange Cove, CIMIS #142 41.3% 1 of 92 days
Panoche, CIMIS #124 25.8% 1 of 89 days
Parlier, CIMIS #39 29.3% 2 of 89 days
SAND_RANCH-01.P, SR1 44.7% 21 of 92 days
Westlands, CIMIS #105 37.2% 7 of 88 days
Kern Arvin-Edison, CIMIS #125 27.4% 0 of 88 days
Blackwells Corner, CIMIS #54 49.4% 2 of 99 days
Belridge, CIMIS #146 22.0% 40 of 88 days
Shafter/USDA, CIMIS #5 14.0% 0 of 86 days
Madera FIREBAUGH/ALISO-01.P, FRBA 39.8% 4 of 90 days
Tulare Delano, CIMIS #182 23.8% 9 of 89 days
Lindcove, CIMIS #86 33.3% 0 of 89 days
Lindcove, LNC 31.1% 4 of 85 days
Porterville, CIMIS #169 50.0% 0 of 97 days

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright 2020 The Regents of the University of California. All rights reserved.

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

Accessibility   web template revised: March 28, 2020 Contact webmaster.