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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_...
Overall, pesticide resistance is increasing. In the 1940s, U.S. farmers lost seven percent of their crops to pests. Since the 1980s, loss has increased to 13 percent, even though more pesticides are being used. Between 500 and 1,000 insect and weed species have developed pesticide resistance since 1945.