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Pesticide resistance is the ability of a pest population, such as insects, fungi, weeds or rodents, to evolve a tolerance to a pesticide that it was previously susceptible to. Retrieved from http://en.wikipedia.org/wiki/Pesticide_...
The diagram below illustrates how refugia slow down the evolution of pesticide-resistant pests by allowing non-resistant pest strains to survive. Refugia may be particularly important in slowing the spread of insects resistant to the pesticide Bt (produced by a gene in the bacterium Bacillus thuringiensis). As one of the few pesticides used by organic farmers, Bt kills a small subset of insects and does not harm many beneficial organisms.