173. “Refugia” is a practice commonly employed to control
1. Diptera
2. Coleoptera
3. Development of resistance in insects
4. Bacillus thuringiensis
What is “Refugia”?
In pest management, refugia refers to areas or populations of pests that are left untreated or are less exposed to pest control measures. This strategy is commonly employed to delay the development of resistance in pest populations, particularly in insects. By maintaining a population of pests that have not been exposed to control agents, such as pesticides or genetically modified crops, it helps preserve susceptible pest genes in the population. This ensures that the resistance to control measures does not spread rapidly, providing more sustainable pest management solutions.
The Role of Refugia in Pest Control
Refugia is especially important in the context of insect resistance management, particularly when using chemical insecticides or Bacillus thuringiensis (Bt) crops. The aim is to prevent the evolution of resistance to these control agents, which can significantly reduce their effectiveness over time. By leaving untreated refugia, you maintain a population of pests that are susceptible to control methods. This creates a breeding ground for these susceptible individuals, helping to dilute the resistant genes in the overall pest population.
How Refugia Affects Insects
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Insect Resistance Development: The practice of creating refugia directly impacts the development of resistance in pest populations. Insects that are not exposed to the control measures (e.g., Bt crops or insecticides) retain their susceptibility, while those exposed may develop resistance. Refugia maintains a population of susceptible insects, slowing down the spread of resistance.
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Effectiveness in Bt Crops: For crops genetically modified with Bt (a naturally occurring bacterium used to kill specific insect pests), refugia is a crucial strategy. Farmers are encouraged to plant non-Bt crops near Bt crops, allowing for the survival of susceptible pest populations. This minimizes the likelihood that all pests in the area will develop resistance to Bt.
Conclusion:
The practice of refugia is a widely used strategy to control the development of resistance in insect populations. It is most commonly applied in the context of pest control for crops, especially when dealing with Bt crops or chemical insecticides.
Correct Answer:
3. Development of resistance in insects
Refugia is primarily employed to manage and delay the development of resistance in insects to control measures like pesticides and Bt crops.
