How pests evolve to become more resistant to pesticides: The main reasons

Pests can evolve to become more resistant to pesticides through a process known as natural selection. 

Over time, this can lead to an increase in the overall population of pesticide-resistant pests.

Here's a more detailed explanation of how this process works.

Genetic Variation

Within any population of pests, there is genetic variation. 

Some pests may have genetic traits that make them more susceptible to pesticides, while others may have traits that provide some level of resistance.

Pesticide Application

When a pesticide is applied, the majority of pests in the population are killed, including those that are susceptible. 

However, a small percentage of pests with natural genetic resistance may survive.

Survival and Reproduction

Pests that survive pesticide exposure have a reproductive advantage. 

Since they carry genes that confer resistance, they are more likely to pass these genes on to their offspring.

Selection Pressure

Continued pesticide use exerts a selection pressure on the pest population. 

Pesticides create an environment where only resistant pests can survive and reproduce, leading to a shift in the overall genetic makeup of the population.

Decreased Effectiveness of Pesticides

As the proportion of resistant pests increases, the effectiveness of the pesticide diminishes. 

What once controlled the pest population effectively may now have limited impact.
 

• Related news:
• pests
• pesticides
• gardening
• adaptation
• 9 August 2023

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