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Exercise 9: Fungicide Resistance Management
With a fungicide that has no fitness cost associated with its resistance,
true management of resistance is not possible–it is possible to slow
down the rate of selection of the resistant biotype, but the frequency of
resistance in the population will inexorably creep upward until it finally
reaches 100%. With even a small fitness reduction in the resistant biotype,
however, it is possible to manage the frequency of resistance in the
population while still maintaining disease control.
Using what you have learned in this exercise, what kind of a spray program
would you put together to maintain effective disease control for at least ten
seasons, using any combination of the four fungicides available to you in the
Venturia dataset?
Start your 10-year simulation by loading the Venturia dataset and using the default
initial inoculum (5000 spores/acre) and benomyl resistance (0.0001%). Use any of the
available fungicides in any dose or frequency of application that you wish, but don't
change the fungicide characteristics. You can change
the spray schedule any time between the end of one season and before you click on
Begin New. Keep a record of the Log for the entire
10-year period.
....return to Introduction
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