Upon exposure to insecticides, insects that do not carry the resistance genes die, thus allowing individuals with the resistance genes to survive and reproduce, creating more resistant insects. With each generation the number of resistant insects increases.
“Resistance is the ability of some individuals in the pest population to survive doses of the insecticide that would be lethal to most individuals in the population”
Classically, there are three mechanisms involved in insect resistance to insecticides, which are:
With this information, we can conclude that The determining factor in the evolution of a pest's resistance to an insecticide is selection pressure.
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