1. General Model Information


Acronym: ACZ_TX

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: not specified
Main application:
Keywords: pest, Rice Water Weevil, crop, rice,empirical equation, temperature sum based, degree day event predictor


TAEX Software Catalog
Texas Agricultural Extension Service
Extension Computer Technology Group
College Station
Texas 77843-2468


Dr. John A. Jackman, Dr. B. M. Drees
PROGRAMMER: Widita Sardjono


This program predicts the emergence of Rice Water Weevil adults from their overwintering habitats which include bunch grasses in wayside areas. After the accumulation of sufficient heat units, adults leave these sites and search for other suitable host plants which includes rice. If rice is in a susceptible stage of vegetative growth and has been flooded or remains in a flood-like condition from persistent rains, weevils will land in fields, produce feeding scars on leaves and deposit eggs. Predictions generated from this program help schedule field scouting activities to determine if an application of an insecticide is justified.
Basically the program requires two types of input: the weather data and the viewing dates. There are two types of weather data: the current weather file and the historical weather file. The quality of the prediction depends on the usage of current weather file, so it is advisable that you always use the current weather file. The program will use the historical weather data for a date only if the current weather data for that date is blank in the current weather data file.
Viewing dates are a set of dates for which rice water weevil emergence will be reported by the program. The viewing dates are selected by specifying a starting date and an ending date. The program will always run the model starting from April 21 until the cumulative emergence reaches 100% regardless of what dates you choose as the starting and ending dates. The dates only affect the report and not the prediction itself.
Additional supporting data needed by the program is the current date, the county name, and the type of graph to be displayed. The current date and the county name is needed for reporting purposes only. The type of graph affects which information is displayed in the graphic reports.
The program can produce two types of output: a numerical report and a graphic report. The numerical report is the more accurate and comprehensive since the graphic report has low resolution. The numerical report includes both the daily and cumulative emergence predicted. The user can choose what data to be displayed in the graphic report (daily emergence only, cumulative emergence only, or both at the same time). Both types of reports include the predicted emergence for the specified viewing dates only.
This program interfaces with the Weather Data Editor (ACJ) for editing and storage of historical and current weather data.

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Source of the Abstract:

II. Technical Information

II.1 Executables:

Operating System(s): DOS, 128k Memory Executable is available at Extension Computer Technology Group Pricing: US$ 35.- outside Texas

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele, Tue Oct 7 1997
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:39 CEST 2002

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