Number of screening generations

The maizes of tropical Africa provided us with a clear indication of the number of screening generations (i.e., breeding cycles) needed to accumulate the maximum levels of horizontal resistance. It requires 10-15 host generations to progress from the minimum to the maximum levels of horizontal resistance. The rate of genetic advance is at its greatest in the early generations, and it declines steadily as resistance accumulates. However, selection pressures can be artificially increased by inoculation of the screening population.

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