1. General Model Information


Acronym: ACN_TX

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: not specified
Main application:
Keywords: crop, pest, sorghum, sorghum midge, Contarinia sorghicola, Johnsongrass, population prediction, empirical equations, temperature sum based


TAEX Software Catalog
Texas Agricultural Extension Service
Extension Computer Technology Group
College Station
Texas 77843-2468
Phone: (409) 845-3929
Fax :


Dr. John Jackman, Dr. N.D. Stone
PROGRAMMERS: Dr. John Jackman, Dr. N.D. Stone, Russell Herdejurgen


The Sorghum Midge Simulation Model (ACN) is a population model that predicts local trends in population density of the sorghum midge, Contarinia sorghicola (Coquillett). The model uses weather data and local cropping information to make population predictions. The predictions can be used for strategic planning of planting dates and for within season predictions of control dates.
Input to run the model consists of estimates of the following information: planting date; field acreage; sorghum variety name; latitude; first planting date for sorghum in the local area; last planting date for sorghum in the local area; expected severity rating; Johnsongrass infestation rating; percent of total acres of sorghum in the local area; and estimated percent of sorghum acres in five planting date classes.
This model calculates the density of two developmental stages, eggs and adults, of the sorghum midge. Midge adults are assumed to come from three sources: 1) spring emergence from diapause, 2) individuals that use Johnsongrass as a host, and 3) individuals that use grain sorghum as a host.
Several simplifying assumptions about the environment are made. Most important is the treatment of a growing region as homogeneous. That is, midge populations respond to the availability of sorghum plants as hosts within the entire region rather than within localized fields of sorghum plants.
This model has been developed based on research of the biology of the sorghum midge. However, the model as a whole has not had extensive field evaluations in all areas where sorghum midge occurs.
The program interfaces with the Weather Data Editor (ACJ) for editing and storage of historical and current weather data.

Source of the Abstract:

II. Technical Information

II.1 Executables:

Operating System(s): DOS

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: ,16. 06. 1997
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:39 CEST 2002

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