|--Real Time Data
Resistan is a mechanistic simulation model of the process of selection
of fungicide-resistant biotypes of a hypothetical fungal pathogen of a
hypothetical crop. The fungus is a polycyclic organism with many generations
per season. There is no genetic component in this simulator. Reproduction
is assumed to be asexual. A small proportion of the initial inoculum is
designated as the fungicide-resistant biotype at the start of the season,
and the response of that population to various fungicide spray programs
is observed as the season progresses.
Resistan can be made to simulate different fungi and different
fungicides by changing the parameters that control the model. All of the
parameters in Resistan (along with several of the options and the initial
values of many of the variables) can be changed during execution of the
program through the menu system. Shown below are
two of the dialog boxes used for changing the parameters of the program.
One interesting feature of this simulation is the ability to include
economic factors in the simulation. Total costs, total revenue, and profit
are calculated at the end of each season (shown below), based on the following
- Fungicide Cost is used in the benefit-cost analysis at the end of
- Application Cost is the cost of a single spray application in the
desired monetary units per unit of land area (e.g., dollars per acre).
This does not include the cost of the fungicide.
- Fixed Costs are the total crop production costs, excluding the fungicide
spray application cost and the cost of the fungicides, in the desired
monetary units per unit of land area (e.g., dollars per acre).
- Maximum Revenue is the expected revenue from the crop without any
losses resulting from the disease (dollars per acre).
- Any system which supports Microsoft Windows 3.0.
- Math coprocessor is strongly recommended.