These non-Bt acres planted near Bt fields are intended to provide a refuge for susceptible corn borers. The goal of the resistance management program described above is to ensure that corn borers moths susceptible to Bt are available to mate with any resistant survivors from Bt fields. Susceptible by resistant matings dilute or mask the resistance in the next generation, preventing the buildup of resistant populations . If the number of susceptible corn borers is high compared to resistant ones, most resistant moths will mate with susceptible moths. The relationship of refuge and high-dose to the prevention of genetic resistance development in ECB populations is described in more detail below.
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