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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.

Format for weather data file for citrus thrips scarring estimates

You may enter your own temperatures into a file and then use that file to estimate citrus thrips damage. You need to supply maximum and minimum temperatures from January 29 through the end of bloom. Temperatures may be entered in Fahrenheit or Celsius; you will be asked to specify the units when you estimate damage.

Specific data file requirements

To be correctly interpreted, note the following requirements for the data file.

  • The file must be a text file.
  • Data values must be separated by either a comma or a tab character.
  • Be prepared to supply the position of date, minimum temperature and maximum temperature in a row. (The position must be the same for every row of data.)
  • Each day's temperatures must be on a separate line in the file.
  • Supply maximum and minimum temperatures from January 29 through the end of bloom.
  • Any row in the file that begins with a double-quote mark (") or a single-quote mark (') will be treated as a comment and ignored in the calculations.
Preparing a data file using a spreadsheet program, such as Excel
  1. Open a new file.
  2. In separate columns, on a single row, enter the date (e.g. 03/12/2001), minimum temperature, and maximum temperature for that date. Enter data for the next date directly below data for the first date. The line may contain other values; these will be ignored by the calculator. Annotate the file with comments by placing a double quote (") or a single-quote (') as the first character of the row.
  3. Save the file as a text file by selecting Save As... under the File menu. Supply a file name and select Text (tab delimited) or CSV (Comma delimited) under Save File as Type:.
Preparing a data file using a text editor or word processor
  1. Open a new file.
  2. On a single line, enter the date (e.g. 03/12/2001), minimum temperature, and maximum temperature, separated by commas or tabs, for that date. Enter data for the next date directly below data for the first date. The line may contain other values; these will be ignored by the calculator. Annotate the file with comments by placing a double quote (") or a single-quote (') as the first character of the row.
  3. Save the file as a text file. Usually, you'll need to select Save As... under the File menu. Supply a file name and specify Text for the file type, if applicable.
Sample data file

"Sample data file for Citrus Thrips damage estimations -- comma-delimited."
"Note: data values may also be tab-delimited (e.g. 'Save As Text (Tab-delimited)' from"
" an Excel spreadsheet."
"This line is a comment."
'This line is a comment, too.'
" A comment is any quoted line -- either single or double."
""
"var 1 = date; var2 = min temp; var3 = max temp; all temps Fahrenheit."
"Note: DATE value is flexible, but do not use commas in a comma-delimited file."
3/13/00,41,72
03/14/2000,43,76
March 15 2000,44,77
Mar 16 2000,50,71
Mar 17 2000,34,74
Mar 18 2000,47,77
Mar 19 2000,44,74
Mar 20 2000,44,70
Mar 21 2000,37,79
"A comment can be inserted anywhere in the file -- they are ignored."
"Note: blank lines are also ignored."

Mar 22 2000,43,73
Mar 23 2000,45,70
Mar 24 2000,39,72
Mar 25 2000,41,72
Mar 26 2000,40,78
Mar 27 2000,47,64
Mar 28 2000,46,70
Mar 29 2000,38,75
Mar 30 2000,39,77
Mar 31 2000,39,84

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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